Schedule of long-term investments available-for-sales securities Tabular disclosure of long-term investments available-for-sales securities that are intended to be held for an extended period of time (longer than one operating cycle). Schedule of Available for Sale Securities, Noncurrent [Table Text Block] Schedule of Available For Sale Securities Noncurrent Roll Forward [Table Text Block] Schedule of long-term investments accounted for available-for-sales securities on a recurring basis Tabular disclosure of changes in the carrying amounts of long-term investments accounted for available-for-sales securities on a recurring basis. Fair value option methods investment The total amount of fair value option method investments that are intended to be held for an extended period of time (longer than one operating cycle). Fair Value Option Methods Investments Balance at the beginning of the period Balance at the end of the period Long Term Investments, Annual Return Percentage on Investment Annual return percentage on investment Represents the percentage of annual return on investment which held in shares that are redeemed during the reporting period. Changes in the carrying amounts of long-term investments measured using fair value option method on a recurring basis Long Term Investments, Fair Value Option Method Roll Forward [Abstract] Investment [Table] Purchase Payments to Acquire Fair Value Option Methods Investments The cash outflow associated with the purchase of fair value option method investments during the period. Disposal Proceeds from Sale of Fair Value Option Methods Investments The cash inflow associated with the sale of fair value option method classified as long-term investments. Foreign exchange difference Fair Value Option Methods Investments Translation Adjustments The increase (decrease) to the carrying value of fair value option method for foreign currency translation adjustments. Changes in long-term investments accounted for available-for-sales securities on a recurring basis Available for Sale Securities Noncurrent [Roll Forward] Fair Value Option Methods Investments Changes in Fair Value Changes in fair value Represents the increase (decrease) in the carrying amount of fair value option method investments due to change in the fair value. Amendment Description Investment Issuer [Axis] Fair Value Option Method Investments [Policy Text Block] Fair value option method investments Disclosure of accounting policy for fair value option method investments. Amendment Flag Investment Issuer [Domain] Information pertaining to Xueersi Peiyou small-class courses offered by the entity to students. Xueersi Peiyou Small Class Courses [Member] Xueersi Peiyou small class course Mobby Courses [Member] Mobby courses Represents information pertaining to Mobby courses offered by the entity to students. Cash Financial Or Equity Instrument Consideration Cash Financial or Equity Instrument Consideration Represents the cash consideration to acquire financial instument or equity ownership of a company. Baby Tree Inc [Member] BabyTree Inc. Represents information pertaining to BabyTree Inc. Third Party Technology Company [Member] Third-party technology company Represents information pertaining to third-party technology company. Beijing Century T A L Education Technology Co Ltd [Member] Represents Beijing Century TAL Education Technology Co., Ltd., a subsidiary of the reporting entity. TAL Beijing Nanjing Xintang Sichuang Education Consulting Co Ltd [Member] Nanjing Xintang Sichuang Education Represents information pertaining to Nanjing Xintang Sichuang Education Consulting Co. Ltd. Guangzhou Yuexiu District Xueersi Training Center [Member] Guangzhou Yuexiu Center Represents information pertaining to Guangzhou Yuexiu District Xueersi Training Center. Nanjing Xintangsichuang Education Training School [Member] Nanjing Xintangsichuang School Represents information pertaining to Nanjing Xintangsichuang Education Training School. Chengdu Jinniu District Xueersi Training School [Member] Chengdu Jinniu School Represents information pertaining to Chengdu Jinniu District Xueersi Training School. Wuhan Wuchang District Xueersi Training School [Member] Wuhan Wuchang School Represents information pertaining to Wuhan Wuchang District Xueersi Training School. Represents information pertaining to Wuhan Jiang'an District Xueersi Education Yongqing Training School. Wuhan Jiangan District Xueersi Education Yongqing Training School [Member] Wuhan Yongqing School Zhengzhou Zhongyuan District Xueersi Training School [Member] Zhengzhou Zhongyuan School Represents information pertaining to Zhengzhou Zhongyuan District Xueersi Training School. Term deposits Investment [Line Items] Zhixuesi Education Consulting Beijing Co Ltd [Member] Zhixuesi Beijing Represents Zhixuesi Education Consulting (Beijing) Co., Ltd., a subsidiary of the reporting entity. Yidu Xuedi Network Technology Beijing Co Ltd [Member] Yidu Xuedi Beijing Represents YiduXuedi Network Technology (Beijing) Co., Ltd., a subsidiary of the reporting entity. Income Tax Additional, Disclosure [Abstract] Additional disclosures Current Fiscal Year End Date Award Type [Axis] Withholding Tax Rate on Dividend Distributed by Foreign Investment Entities Withholding tax rate (as a percent) Represents the withholding tax rate on dividends distributed by the foreign investment entities. Undistributed Earnings of Subsidiaries Variable Interest Entities and Subsidiaries of Variable Interest Entities Aggregate undistributed earnings of the company's subsidiaries, VIEs and VIEs subsidiaries located in the PRC Represents the aggregate amount of undistributed earnings of subsidiaries, variable interest entities and subsidiaries of variable interest entities. Increase in income tax expense and earnings per share amounts, If Xueersi Education, Yidu Huida and TAL Beijing were not in a tax holiday period Income Tax Holiday [Abstract] Common Stock Shares, Number of Classes Number of classes of common shares Represents the number of classes of common shares of the entity. Number of Votes Per Common Share Held Number of votes to which holders of common shares are entitled for each share held Represents the number of votes to which the holders of common stock are entitled for each share held. Number of Class A common shares into which each Class B common share is convertible Number of shares of other class of common stock into which each class B common share may be converted. Common Stock Number of Shares Called by Each Class B Common Share Represents the number of ordinary shares represented by the American Depositary Shares issued during the period. Equivalent Number of Shares for American Depository Shares Issued During Period Number of shares represented by American depositary shares issued Proceeds from Issuance, Initial Public Offering, Net Net proceeds from IPO The net cash inflow associated with the amount received from the entity's first offering of stock to the public. Number of Convertible Shares Converted Number of convertible shares converted The number of convertible shares (including preferred shares and common shares), converted into other class of common shares during the period. Share Based Compensation Arrangement, by Share Based Payment Award, Equity Instruments Other than Options Vested and Converted into Stocks Non-vested shares vested and converted The number of equity-based payment instruments, excluding stock (or unit) options that are vested and converted into stocks during the reporting period. Beijing Haidian Holiday Culture Training School [Member] Represents Haidian Holiday Culture Training School, an entity in which equity interest is acquired and recorded as a long-term investment. Holiday School Document Period End Date Schedule of Impairment on Long Term Investments [Line Items] Impairment on long-term investment Cost Method Investments Equity Interest Acquired Represents the percentage of equity interest acquired during the reporting period and recorded as a cost method investment. Equity interest acquired (as a percent) Long Term Investments Ownership Interest Acquired Percentage of equity interest acquired Represents the percentage of ownership interest acquired in investments that are intended to be held for an extended period of time (longer than one operating cycle) by the entity. Tabular disclosure providing information pertaining to income tax. Income Tax Disclosure [Table] Status for Taxability [Axis] Represents information pertaining to various tax statuses. Represents various tax statuses. Status for Taxability [Domain] Represents the entity's classification as high and new technology enterprises that receive preferential tax treatment. High and New Technology Enterprises [Member] HNTE Newly Established Software Enterprises [Member] Represents the entity's classification as newly established software enterprises that receive preferential tax treatment. Newly established software enterprise High-tech company High Tech Company [Member] Represents the entity's classification as high-tech company since the entity is located in high technology zone in Beijing that receive preferential tax treatment. Entity [Domain] Income taxes Income Tax Disclosure [Line Items] Income Tax Preferential Tax Rate Preferential tax rate (as a percent) Represents the preferential tax rate applicable to the entity under the preferential tax treatment. PRC CHINA Tabular disclosure of the components of property, plant and equipment. Schedule of Property, Plant and Equipment Components [Table Text Block] Schedule of property and equipment, net Schedule of long-term prepayments Tabular disclosure of carrying amounts as of the balance sheet date of amounts paid in advance for expenses which will be charged against earnings in periods after one year or beyond the operating cycle, if longer. Schedule of Long Term Prepaid Expense [Table Text Block] Number of Agreements Signed Number of agreements signed by the Group with McGraw-Hill Hong Kong Limited Represents the number of agreements signed by the entity. Total amount of the agreements to develop English teaching materials Represents the aggregate amount of agreements entered into by the entity for development of English teaching materials. English Teaching Materials Development Agreement Amount Intangible Assets Recorded Intangible assets recorded Represents the intangible assets recorded upon delivery of one set of the teaching materials under agreements to develop English teaching materials. Business Tax and Surcharges Rate Maximum Business tax and surcharges rate, maximum (as a percent) Represents the maximum business tax and surcharges rate. Government Subsidies [Abstract] Government subsidies Foreign Currency Risk [Abstract] Foreign Currency Risk Government Subsidies Received Government subsidies received Amount of government grants, incentives and subsidies received during the period. Wuhan Jianghan School [Member] Wuhan Jianghan School Represents information pertaining to Wuhan Jianghan School, an acquiree of the entity. Mutual Funds [Member] Mutual fund Type of investment vehicle that pools funds from investors and invests in stocks, bonds and/or other types of securities. Century Mingde Represents information pertaining to Century Mingde Education Technology Company Limited. Century Mingde Education Technology Company Limited [Member] Teevoo Brothers Technology Limited [Member] Third-party online platform Represents information pertaining to Teevoo Brothers Technology Limited. Disclosure of accounting policy for business tax on revenues related to services. Business Tax [Policy Text Block] Business tax Government Subsidies [Policy Text Block] Government subsidies Disclosure of accounting policy for government subsidies. Represents the maturity period of term deposits. Investment Maturity Period Original maturity terms Computer, network equipment and software Long-lived, depreciable assets used in the creation, maintenance and utilization of information systems which include computers, network equipment and software applications. Computer Network Equipment and Software [Member] Represents Beijing Huanqiu Zhikang Shidai Education Consulting Co., Ltd., a subsidiary of the reporting entity. Beijing Huanqiu Zhikang Shidai Education Consulting Co Ltd [Member] Huanqiu Zhikang Beijing Yidu Huida Education Technology Co Ltd [Member] Yidu Huida Represents Beijing Yidu Huida Education Technology Co., Ltd., a subsidiary of the reporting entity. Represents Yidu Technology Group, a subsidiary of the reporting entity. Yidu Technology Group [Member] Yidu Cayman Xueersi Education Represents Beijing Xueersi Education Technology Co., Ltd., a variable interest entity in which the entity has a controlling interest through contractual arrangements. Beijing Xueersi Education Technology Co Ltd [Member] Beijing Xueersi Education Network Co Ltd [Member] Xueersi Network Represents Beijing Xueersi Network Technology Co., Ltd., a variable interest entity in which the entity has a controlling interest through contractual arrangements. Beijing Dongfangrenli Science and Commerce Co Ltd [Member] Beijing Dongfangrenli Represents Beijing Dongfangrenli Science & Commerce Co., Ltd., a variable interest entity in which the entity has a controlling interest through contractual arrangements. Beijing Haidian District Xueersi Training School [Member] Beijing Haidian School Represents Beijing Haidian District Xueersi Training School, a variable interest entity in which the entity has a controlling interest through contractual arrangements. Represents Beijing Dongcheng District Xueersi Training School, a variable interest entity in which the entity has a controlling interest through contractual arrangements. Beijing Dongcheng District Xueersi Training School [Member] Beijing Dongcheng School Beijing Zhikang Culture Distribution Co Ltd [Member] Zhikang Represents Beijing Zhikang Culture Distribution Co., Ltd., a variable interest entity in which the entity has a controlling interest through contractual arrangements. Wuhan Jianghan School Represents Wuhan Jianghan District Xueersi English Training School, a variable interest entity in which the entity has a controlling interest through contractual arrangements. Wuhan Jianghan District Xueersi English Training School [Member] Represents Shanghai Lehai Science and Technology Information Co., Ltd., a variable interest entity in which the entity has a controlling interest through contractual arrangements. Shanghai Lehai Science and Technology Information Co Ltd [Member] Shanghai Lehai Represents the common shares receivable during the reporting period. Common Shares Subscription Receivable [Member] Common shares subscription receivable Document and Entity Information Accrued expenses and other current liabilities (including accrued expenses and other current liabilities of the consolidated VIEs without recourse to TAL Education Group of $11,269,507 and $18,920,194 as of February 28, 2013 and 2014, respectively) Accrued Expenses and Other Liabilities Current Accrued expenses and other current liabilities Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes (excluding income), interest, rent, salary and welfare payable and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Total Government grants, incentives and subsidies from various governments to increase business. Government subsidies recorded Government Subsidies Government subsidies Statutory Reserve Provision for statutory reserve The transfer of earned surplus set aside in accordance to local government requirements. The value received from an entity's raising of capital via private rather than public placement. Subscription received Subscription Received Payment of Capital Distribution, Declared Equity impact of aggregate cash, stock, and paid-in-kind dividends declared for all securities (common shares, preferred shares, etc.) during the period. Distribution to shareholders Capital contribution Adjustments to Additional Paid in Capital Capital Infusion Increase in additional paid in capital resulting from a capital infusion received from a shareholder during the period. Reduction of additional paid-in capital resulting from dividends legally declared or paid in excess of the balance in IPO Proceeds. Dividends to shareholders Dividend to Shareholder The net amount of class A common stock issued during the period upon the conversion of class B common stock. Conversion of Class B common shares to Class A common shares Stock Issued During Period, Value, Conversion of Securities Common shares issued due to conversion of convertible shares Conversion of Class B common shares to Class A common shares (in shares) Stock Issued During Period, Shares, Conversion of Securities Number of class A common shares issued during the period as a result of the conversion of class B common stock. Gains (Losses) on Extinguishment of Debt Currency Adjustment Gain on extinguishment of liabilities Amount represents the difference between the fair value of the payments made and the carrying amount of the debt at the time of its extinguishment with a currency translation adjustment. Term deposits Term Deposits Increase (Decrease) The change in excess cash invested in liquid investments with original maturities of three months or more but less than a year. The entire disclosure represents the extinguishment of liabilities. Extinguishment Of Liabilities Disclosure [Text Block] EXTINGUISHMENT OF LIABILITIES Entity Well-known Seasoned Issuer IMPAIRMENT ON LONG-TERM INVESTMENT Impairment on Long Term Investment Disclosure [Text Block] The entire disclosure for impairment on long term investment incurred during the period . IMPAIRMENT ON LONG-TERM INVESTMENT Entity Current Reporting Status Long Term Prepayments Disclosure [Text Block] The entire disclosure for long term prepayments incurred during the period . LONG-TERM PREPAYMENTS Entity Filer Category The entire disclosure pertaining to the statutory reserve fund required to be maintained under the PRC laws and regulations and related restricted net assets. Statutory Reserves and Restricted Net Assets Disclosure [Text Block] STATUTORY RESERVES AND RESTRICTED NET ASSETS Entity Public Float CAPITAL CONTRIBUTION Entity Registrant Name Capital Contribution Disclosure [Text Block] CAPITAL CONTRIBUTION The entire disclosure represents the capital contribution made during the reporting period. Entity Central Index Key DISTRIBUTION TO SHAREHOLDERS Distribution to Shareholders Disclosure [Text Block] DISTRIBUTION TO SHAREHOLDERS The entire disclosure for dividends paid or payable in the aggregate for each period presented. Hong Kong HONG KONG Issuance Cost of Redeemable Convertible Preferred Stock Proceeds from issuance of Series A convertible redeemable preferred shares, issuance cost Represents the issuance cost associated with proceeds from issuance of convertible redeemable preferred shares. IMPAIRMENT LOSS ON INTANGIBLE ASSETS AND GOODWILL Entity Common Stock, Shares Outstanding Schedule of Major Subsidiaries and Consolidated Variable Interest Entities [Table Text Block] Schedule of the Company's subsidiaries and VIE and VIE's significant subsidiaries Tabular disclosure of the details of the company's subsidiaries, its VIEs and VIEs' subsidiaries. Schedule of Major Subsidiaries and Consolidated Variable Interest Entities and Schools [Table Text Block] Schedule of the Company's subsidiaries and VIEs and VIE's subsidiaries and schools Tabular disclosure of the details of the company's subsidiaries, its VIEs and VIEs' subsidiaries and schools. Organization and Principal Activities [Table] Contains information pertaining to organization and principal activities of the entity. Xueersi International Education Group [Member] Xueersi Hong Kong Represents Xueersi International Education Group Limited, a subsidiary of the reporting entity. TAL Education Technology Beijing Co Ltd [Member] TAL Beijing Represents TAL Education Technology (Beijing) Co., Ltd., a subsidiary of the reporting entity. Shanghai Changning District Xueersi Lejiale School [Member] Shanghai Changning School Represents Shanghai Changning District Xueersi-Lejiale School, a variable interest entity in which the entity has a controlling interest through contractual arrangements. Shanghai Minhang District Lejiale School [Member] Shanghai Minhang School Represents Shanghai Minhang District Lejiale School, a variable interest entity in which the entity has a controlling interest through contractual arrangements. Beijing Xicheng District Xueersi Training School [Member] Beijing Xicheng School Represents Beijing Xicheng District Xueersi Training School, a variable interest entity in which the entity has a controlling interest through contractual arrangements. Shanghai Xueersi Education Information Consulting Co Ltd [Member] Shanghai Education Represents Shanghai Xueersi Education Information Consulting Co., Ltd., a variable interest entity in which the entity has a controlling interest through contractual arrangements. Represents Tianjin Xueersi Education Information Consulting Co., Ltd., a variable interest entity in which the entity has a controlling interest through contractual arrangements. Tianjin Xueersi Education Information Consulting Co Ltd [Member] Tianjin Education Represents Guangzhou Xueersi Education Technology Co., Ltd., a variable interest entity in which the entity has a controlling interest through contractual arrangements. Guangzhou Xueersi Education Technology Co Ltd [Member] Guangzhou Education Represents Shenzhen Xueersi Education Technology Co., Ltd., a variable interest entity in which the entity has a controlling interest through contractual arrangements. Shenzhen Xueersi Education Technology Co Ltd [Member] Shenzhen Education Represents Beijing Haidian District Lejiale Training School, a variable interest entity in which the entity has a controlling interest through contractual arrangements. Beijing Haidian District Lejiale Training School [Member] Beijing Lejiale School Represents Tianjin Hexi District Xueersi Training School, a variable interest entity in which the entity has a controlling interest through contractual arrangements. Tianjin Hexi District Xueersi Training School [Member] Hexi Xueersi School Represents Hangzhou Xueersi Education Consulting Co., Ltd., a variable interest entity in which the entity has a controlling interest through contractual arrangements. Hangzhou Xueersi Education Consulting Co Ltd [Member] Hangzhou Education Wuhan Jiangan District Xueersi Training School [Member] Wuhan Jiang'an School Represents Wuhan Jiangan District Xueersi Training School, a variable interest entity in which the entity has a controlling interest through contractual arrangements. Beijing Chaoyang School Represents Beijing Chaoyang District Xueersi Training School, a variable interest entity in which the entity has a controlling interest through contractual arrangements. Beijing Chaoyang District Xueersi Training School [Member] Document Fiscal Year Focus Represents Beijing Xueersi Nanjing Education Consulting Co., Ltd., a variable interest entity in which the entity has a controlling interest through contractual arrangements. Beijing Xueersi Nanjing Education Consulting Co Ltd [Member] Nanjing Education Document Fiscal Period Focus Xian Xueersi Network Technology Co Ltd [Member] Xi'an Network Represents Xi'an Xueersi Network Technology Co., Ltd., a variable interest entity in which the entity has a controlling interest through contractual arrangements. Represents Shanghai Xueersi Network Technology Co., Ltd., a variable interest entity in which the entity has a controlling interest through contractual arrangements. Shanghai Xueersi Network Technology Co Ltd [Member] Shanghai Network Represents Chengdu Xueersi Education Consulting Co., Ltd., a variable interest entity in which the entity has a controlling interest through contractual arrangements. Chengdu Xueersi Education Consulting Co Ltd [Member] Chengdu Education Represents Beijing Shijingshan District Xueersi Training School, a variable interest entity in which the entity has a controlling interest through contractual arrangements. Beijing Shijingshan District Xueersi Training School [Member] Beijing ShijingshanSchool Taiyuan Yingze School Represents TaiyuanYingze District Xueersi Training School, a variable interest entity in which the entity has a controlling interest through contractual arrangements. Taiyuan Yingze District Xueersi Training School [Member] Suzhou Xueersi Network Technology Co Ltd [Member] Suzhou Network Represents Suzhou Xueersi Network Technology Co., Ltd., a variable interest entity in which the entity has a controlling interest through contractual arrangements. Chongqing Shapingba District Xueersi Education Training School [Member] Chongqing Shapingba School Represents Chongqing Shapingba District Xueersi Education Training School, a variable interest entity in which the entity has a controlling interest through contractual arrangements. Organization and Principal Activities [Line Items] Organization and principal activities Schedule of consolidated financial statement balances and amounts of the Company and its subsidiaries, excluding the Company's VIEs, included in the consolidated financial statements after the elimination of the inter-company transactions and balances Tabular disclosure of financial statement balances and amounts of the entity and its subsidiaries, excluding the entity's VIEs, included in the consolidated financial statements after the elimination of the inter-company transactions and balances. Schedule of Consolidation of Entity and Subsidiaries Financial Statement Balances and Amounts [Table Text Block] Income statement and cash flow statement Income and Cash Flow Statement Related Disclosures [Abstract] Disclosure of accounting policy for value-added-tax assessed by governmental entities on sale of products. Value added tax Value Added Tax [Policy Text Block] Legal Entity [Axis] Student Base [Member] Student base Represents information pertaining to student base of the entity. Document Type Educational programs and services Information pertaining to educational programs and services primarily consisting of after-school group tutoring, after-school one-on-one tutoring and training courses for preschool children. Educational Programs and Services [Member] SIGNIFICANT ACCOUNTING POLICIES Online Education Services [Member] Online education services Information pertaining to online education services provided by the entity to its customers including audio-video course content. Educational Materials and Others [Member] Educational materials and others Information pertaining to educational materials and others sold by the entity to students at the entity's service centers. Schedule of Value Added Tax [Table] Disclosures pertaining to value-added-tax. Small Scale VAT Payers [Member] Small scale VAT payer Represents information pertaining to the small scale VAT payers. Inter Company Technical Services [Member] Inter-company technical services Information pertaining to inter-company technical services provided by the entity. General VAT payer Represents information pertaining to the general VAT payers. General VAT Payers [Member] Software Products [Member] Software products Represents information pertaining to certain software related products that are qualified as software products by PRC tax authorities. Value added tax Value Added Tax [Line Items] Represents the statutory rate of value-added-tax as percentage of gross sales. Value Added Tax Rate VAT rate (as a percent) Value Added Tax Refund Rate VAT refund rate (as a percent) Represents the rate of value-added-tax as percentage of gross sales. Business Tax [Abstract] Business tax Represents the minimum business tax and surcharges rate. Business Tax and Surcharges Rate Minimum Business tax and surcharges rate, minimum (as a percent) Prepayments to suppliers Amount paid in advance for advertising and purchases of fixed assets. Advance Payments Suppliers Current Schedule of Accrued Liabilities and Other Current Liabilities [Table Text Block] Schedule of accrued expenses and other current liabilities Tabular disclosure of accrued expenses and other liabilities that are classified as current at the end of the reporting period. Operating Leases Future Minimum Payments Due in Five Years and Thereafter February 2019 and after Amount of required minimum rental payments maturing in the fifth fiscal year and after following the latest fiscal year for operating leases having initial or remaining non-cancelable letter-terms in excess of one year. Founding Shareholder [Member] Represents information pertaining to founding shareholder of the entity. Founding shareholder ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES Accounts Payable and Accrued Liabilities Disclosure [Text Block] Represents the number of founding shareholders who paid acquisition consideration on the behalf of the entity. Number of Founding Shareholders who Paid Acquisition Consideration Number of founding shareholders who paid acquisition consideration on behalf of the Group Number of Legal Owners of Variable Interest Entities Number of legal owners of VIE Represents the number of legal owners of variable interest entities. Number of Lega lOwner and Director of Vies also Director of Reporting Entity Represents the number of legal owner and director of variable interest entities, who is also a director of the reporting entity. Number of legal owner and director of variable interest entities, who is also a director of the reporting entity Number of Loans Received by Nominee Share holders of Vies in the Past Represents the number of loans received by the nominee shareholders of the VIEs in the past for capital contribution. Number of loans received by the nominee shareholders of the VIEs in the past for capital contribution Comprehensive Income Net of Tax Available to Common Stockholders Basic Comprehensive income attributable to TAL Education Group shareholders Comprehensive income (loss), net of tax after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). Percentage of after-tax income required to be transferred to statutory surplus reserve Represents the percentage of after-tax income required to be appropriated towards the general reserve fund for foreign-invested enterprises established in the People's Republic of China until the reserve balance reaches a specified percentage of the registered capital. Appropriation of after Tax Income to Statutory Surplus Reserve Per Annum Statutory surplus reserve as a percentage of registered capital up to which after-tax income of PRC subsidiaries and VIEs shall be transferred Represents the level of the statutory surplus reserve balance as a percentage of registered capital for entities incorporated in the People's Republic of China which must be attained before mandatory transfers to the reserve are no longer required. Reserve Level Threshold for Mandatory Transfer Percentage Minimum annual appropriations to development fund as a percentage of annual net income, for private school which requires reasonable returns Represents the minimum percentage of after-tax income required to be appropriated towards the development fund for construction or maintenance of the school or procurement or upgrading of educational equipment for private schools that require reasonable returns. Minimum Appropriation of after Tax Income to Development Fund Percentage for Private Schools Requiring Reasonable Return Net Revenue from Variable Interest Entity and Subsidiaries of Variable Interest Entity and Schools as Percentage of Total Net Revenue Net revenue from VIEs and their subsidiaries and schools as a percentage of total net revenue Represents the net revenue earned from Variable Interest Entities (VIE), their subsidiaries and schools expressed as a percentage of total net revenue. Minimum Appropriation of Annual Increase of Net Assets to Development Fund for Private Schools that do not Require Reasonable Return Minimum annual appropriation to development fund as a percentage of the annual increase in net assets for private schools which do not require a reasonable return Represents the minimum percentage of the annual increase in net assets required to be appropriated towards the development fund for private schools that do not require a reasonable return. Appropriations to Statutory Surplus Reserve Appropriation to the statutory surplus reserve Represents the amount of after-tax income appropriated toward the statutory surplus reserve. Appropriation to the development fund Represents the amount of after-tax income appropriated toward the development fund. Appropriations to Development Fund Paid-in capital of Company's PRC subsidiaries, VIEs and VIEs' subsidiaries Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year attributable to paid-in capital. Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries Attributable to Paid in Capital Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries Attributable to Statutory Reserve and Development Fund Statutory reserve plus development fund of Company's PRC subsidiaries, VIEs and VIEs' subsidiaries Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year attributable to statutory reserve and development fund. Payable to employees Accounts Payable, Underwriters, Promoters, and Employees (Other than Salaries and Wages), Current Statutory reserve of Company's PRC subsidiaries, VIEs and VIEs' subsidiaries Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year attributable to statutory reserve. Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries Attributable to Statutory Reserve Long Term Investments [Policy Text Block] Long-term investments Disclosure of accounting policy for long-term investments. LONG-TERM PREPAYMENTS Term Deposits [Policy Text Block] Term deposits Disclosure of accounting policy for term deposits. Small-class courses Information pertaining to small-class courses offered by the entity to students. Small Class Courses [Member] Represents preschool courses offered by the entity to students. Preschool courses Preschool Courses [Member] Number of Classes Per Course Minimum Quantity Required The minimum number of classes per course that must be purchased to be eligible for course refunds. Number of classes per course to be eligible for refund of course fees Number of Characteristics of Controlling Financial Interest Number of characteristics of a controlling financial interest Represents the number of characteristics of a controlling financial interest held in any entity. The upper end of the range of quotients represented as a percentage derived by dividing the number of classes in a course by the total number classes in the course, that qualifies for refunds. Percentage of Course Delivered for Refund of Course Fees Threshold Maximum Threshold percentage of course delivered for refund of course fees Refund of Course Fees Percentage Represents the percentage of course fees received that would be refunded to students who withdraw from a course. Percentage of course fees that would be refunded Course offer period Course Offer Period Represents the course offer period. Information by type of tax payers pertaining to value-added-tax. Value Added Tax Payers Type [Axis] Value Added Tax Payers [Domain] Identification of the types of tax payers. Guidance books Represents the guidance books sold by the entity. Guidance Books [Member] Number of Securities in Mutual Funds Purchased Represents the number of securities in mutual funds bought by the entity. Number of securities in mutual funds bought Reconciliation of available-for-sale securities measured and recorded at fair value on a recurring basis Available for Sale Securities, Current [Roll Forward] Available for Sale Securities Changes in Fair Value Changes in fair value Represents the increase (decrease) in the carrying amount of available-for-sale securities due to change in the fair value. Available for Sale Securities Translation Adjustments Foreign exchange difference The increase (decrease) to the carrying value of available-for-sale securities for foreign currency translation adjustments. American Depository Receipt Receivable, Current ADR receivable Represents receivable due from ADR bank according to the reimbursement expense agreements between the company and ADR bank, expected to be collected within one year or the normal operating cycle, if longer. Study Cards Receivable, Current Study cards receivable Represents the amount of study cards receivable, which is expected to be collected within one year or the normal operating cycle, if longer. Lessee Leasing Arrangements Operating Leases Term of Contract Maximum Represents the maximum term of the lessee's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Maximum term of non-cancellable leases Qianjiang and Jianli School [Member] Qianjiang and Jianli School Represents the Qianjiang and Jianli School. Qianjing School and Jianli School Number of Business Liquidated Number of business liquidated Represents the number of business liquidated during the period. Prepaid Expense for Teaching Materials Development, Noncurrent Prepaid for teaching materials development Carrying amount as of the balance sheet date of amounts paid in advance to the counterparty under agreement for teaching materials development which will be charged against earnings in periods after one year or beyond the operating cycle, if longer. Prepayment was fully written off Represents the amount of prepayment that was fully written off during the period. Prepaid Expense for Acquisition of License Written Off Refund of Course Fees after Specified Percentage of Course Delivered Amount of course fees that would be refunded after specified percentage of course delivered Represents the amount of course fees that would be refunded to students who withdraw from a course after specified percentage of course is delivered. Accrued Government Subsidies Current Government subsidies Carrying value as of the balance sheet date of obligations incurred through that date and payable for government subsidies. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Prepaid Expense for Acquisition of License Recorded as Restricted Cash Prepayment amount recorded as restricted cash Represents the prepayment amount that was cash deposit required by the Education Bureau and recorded as restricted cash as of the balance sheet date. Accounts payable Accounts payable (including accounts payable of the consolidated VIEs without recourse to TAL Education Group of $1,739,337 and $2,004,659 as of February 28, 2013 and 2014, respectively) Accounts Payable, Current Prepaid for acquisition of license Carrying amount as of the balance sheet date of amounts paid in advance under acquisition agreements entered into by the entity to obtain the study-abroad intermediary service operating license which will be charged against earnings in periods after one year or beyond the operating cycle, if longer. Prepaid Expense for Acquisition of License, Noncurrent Refund of Course Fees after Commencement of Courses with Less than Specified Classes Amount of course fees that would be refunded after commencement of courses with less than seven classes Represents the amount of course fees that would be refunded to students who withdraw from a course commencement of courses with less than specified number of classes. Tax Payable Other, Current Represents the carrying value as of the balance sheet date of obligations incurred and payable for other taxes not separately disclosed in the balance sheet. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle, if longer). Other taxes payable Accrued Enrollment Fees Collected for Sponsors, Current Enrollment fees collected for sponsors Carrying value as of the balance sheet date of enrollment fees collected on behalf of sponsors. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle, if longer). Payable for Acquisition, Current Payable for acquisition of Wuhan Jianghan School Carrying value as of the balance sheet date of obligations incurred through that date and payable for acquisition. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle, if longer). Payable for Investment, Current Payable for investment in Holiday School Carrying value as of the balance sheet date of obligations incurred through that date and payable for investment. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle, if longer). Represents the number of sets of English teaching materials which is to be developed by the party under agreement. Number of Sets of English Teaching Materials to be Developed Number of sets of English teaching materials to be developed by McGraw-Hill Hong Kong Limited Represents the number of sets of English teaching materials delivered by the party under the agreement. Number of Sets of English Teaching Materials Delivered Number of sets of English teaching materials delivered by McGraw-Hill Hong Kong Limited Vesting on First Anniversary of Grant Date [Member] On first anniversary of the date of grant Represents the vesting of awards on first anniversary of the date of grant. Represents information pertaining to the vesting period of awards over January 26 of each year from 2012 to 2023. Vesting Over Period from 26 January 2012 to 26 January 2023 [Member] January 26 of each year from 2013 to 2023 Represents the vesting of awards on January 26 of 2013. Vesting on 26 January, 2013 [Member] January 26 of 2013 Represents the vesting of awards on January 26 of 2014. Vesting on 26 January, 2014 [Member] January 26 of 2014 Vesting on 26 January, 2015 [Member] January 26 of 2015 Represents the vesting of awards on January 26 of 2015. Vesting on 26 January, 2016 [Member] January 26 of 2016 Represents the vesting of awards on January 26 of 2016. Vesting on 26 January, 2017 [Member] January 26 of 2017 Represents the vesting of awards on January 26 of 2017. Vesting on 26 January, 2018 [Member] January 26 of 2018 Represents the vesting of awards on January 26 of 2018. Vesting on 26 January, 2019 [Member] January 26 of 2019 Represents the vesting of awards on January 26 of 2019. Vesting on 26 January, 2020 [Member] January 26 of 2020 Represents the vesting of awards on January 26 of 2020. Vesting on 26 January, 2021 [Member] January 26 of 2021 Represents the vesting of awards on January 26 of 2021. Vesting on 26 January, 2022 [Member] January 26 of 2022 Represents the vesting of awards on January 26 of 2022. Vesting on 26 January, 2023 [Member] January 26 of 2023 Represents the vesting of awards on January 26 of 2023. Vesting Over Period from 26 July, 2012 to 26 July, 2014 [Member] July 26 of each year from 2012 to 2014 Represents the information pertaining to the vesting period of awards over July 26 of each year from 2012 to 2014. Vesting on 26 July, 2012 [Member] July 26 of 2012 Represents the vesting of awards on July 26 of 2012. Vesting on 26 July, 2013 [Member] July 26 of 2013 Represents the vesting of awards on July 26 of 2013. Represents the vesting of awards on July 26 of 2014. Vesting on 26 July, 2014 [Member] July 26 of 2014 Represents the vesting of awards over the next two anniversaries subsequent to first anniversary of the date of grant. Vesting Over Next Two Anniversaries of Grant Date [Member] Over the next two anniversaries of the date of grant Represents the vesting of awards over the next four anniversaries subsequent to three anniversaries of the date of grant. Vesting Over Next Four Anniversaries of Grant Date [Member] Over the next four anniversaries of the date of grant Vesting Over Period Beginning July 2011 Through January 2015 [Member] Period beginning July 2011 through January 2015 Represents the vesting of awards beginning July 2011 through January 2015. Vesting on October 19 of Each Year for Three Years from Grant Date [Member] On October 19 of each year for three years subsequent to the date of grant Represents the vesting of awards on October 19 of each year for three years subsequent to the date of grant. Vesting over Next Three Anniversaries of Grant Date [Member] Over the three anniversaries of the date of grant Represents the vesting of awards over the three anniversaries of the date of grant. Vesting on Second Anniversary of Grant Date [Member] On second anniversary of the date of grant Represents the vesting of awards on second anniversary of the date of grant. Vesting on Third Anniversary of Grant Date [Member] On third anniversary of the date of grant Represents the vesting of awards on third anniversary of the date of grant. Vesting on Fourth Anniversary of Grant Date [Member] On fourth anniversary of the date of grant Represents the vesting of awards on fourth anniversary of the date of grant. Officer and Director [Member] Represents information pertaining to independent director and officer of the entity. Independent director and officer Award Modified [Axis] Information pertaining to the awards modified. Award Modified [Domain] Information pertaining to the awards modified by number of awards. Modified Award One [Member] 70,000 nonvested shares modified Information pertaining to the awards modified by number of awards. Modified Award Two [Member] 12,000 nonvested shares modified Represents the second group of modified awards. Modified Award Three [Member] 52,500 nonvested shares modified Represents the third group of modified awards. 12000 and 52500 nonvested shares modified Represents the second and third group of modified awards. Modified Award Two and Three [Member] Share Based Compensation Arrangement by Share Based Payment Award Percentage of Granted Awards which will Vest Percentage of granted non vested shares which will vest Represents the percentage of granted awards that will vest on the scheduled vesting date. Share Based Compensation Arrangement by Share Based Payment Award Vesting Number of Batches Number of batches in which nonvested shares will vest Represents the number of batches in which awards granted under the share-based compensation plan will vest. Represents the number of next anniversaries of the date of grant over which awards granted under the share-based compensation plan will vest. Share Based Compensation Arrangements by Share Based Payment Award Vesting Number of Next Anniversaries of Grant Date Number of next anniversaries of the date of grant over which nonvested awards will vest Share Based Compensation Arrangement by Share Based Payment Award Original Award Vesting Period Original vesting period Represents the original period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition. Number of nonvested shares under modification Represents the number of awards affected by the modification of an equity-based compensation plan. Share Based Compensation Arrangement by Share Based Payment Award Plan Modification Number of Awards Affected The number of individuals affected by the modification of an equity-based compensation plan. Share Based Compensation Arrangement by Share Based Payment Award Plan Modification, Number of Individuals Affected Number of persons affected by modification Schedule of Impairment on Long Term Investments [Table] Represents information required and determined to be disclosed concerning impairment of the entity's long-term investments. Income Tax Exemption Period Represents the income tax exemption period under the preferential tax treatment. Period for exemption from EIT Income Tax Additional Disclosures [Abstract] Additional disclosures Maximum period to make delinquent tax payment to taxpayer or withholding agent, if underpayment of taxes is resulted from the tax authority's act or error Represents the period of statute of limitations for the entity's income tax returns, if there is underpayment of income taxes due to tax authority's act or error. Income Tax Period of Statute of Limitations if Underpayment is Due to Act or Error of Tax Authority Statute of limitations period for underpayment of income taxes due to computational errors Represents the period of statute of limitations for the entity's income tax returns, if there is underpayment of income taxes due to computational errors. Income Tax Period of Statute of Limitations if Underpayment is Due to Computational Errors Statute of limitations period under special circumstances Represents the extended period of statute of limitations for the entity's income tax returns if the underpayment of taxes is due to special circumstances. Income Tax Period of Statute of Limitations under Special Circumstances Threshold amount of an underpayment of tax liability for specifically listing it under special circumstance for statute of limitation Represents the minimum amount of underpayment of tax liability considered as a special circumstance under the statute of limitations. Income Tax Statute of Limitations Special Circumstance Minimum Underpayment of Tax Liability Statute of limitations period for transfer pricing related adjustment Represents the period of statute of limitations for the entity's income tax returns containing transfer pricing adjustment. Income Tax Period of Statute of Limitations for Transfer Pricing Adjustment Cost Method Investee Name [Domain] This element provides the name of each cost method investee, or group of cost method investees. Number of acquired schools for which goodwill impairment loss recognized Represents the number of businesses for which impairment loss on goodwill recognized during the period. Goodwill Impairment Loss Recognized Number of Businesses Represents Xueersi International Education Group Limited, a subsidiary of the reporting entity. Xueersi International Education Group Limited [Member] Xueersi Hong Kong Represents Qianjiang School and Jianli School. Qianjiang School and Jianli School Qianjiang School and Jianli School [Member] Partnership Agreement [Member] Intangible business relationship under a partnership arrangement. Partnership agreement Accumulated Goodwill Impairment [Roll Forward] A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. Accumulated goodwill impairment Carrying value as of the balance sheet date of proceeds of vested shares awards collected on behalf of employees. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle, if longer). Due to Employees Shares Proceed Current Proceeds from employees' transferring stocks Carrying value as of the balance sheet date of obligations incurred through that date and payable for teaching material of the entity's goods and services. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Accrued Teaching Material Costs Current Accrued teaching material costs Represents information pertaining to the employees. Employees Employees [Member] Represents information pertaining to the employees and independent directors. Employees and independent directors Employees and Independent Directors [Member] Represents information pertaining to the executive officers and employees. Executive officers and employees Executive Officers and Employees [Member] Common Shares [Text Block] The entire disclosure for common stock related matters, including but limited to rights and privileges of each class of stock authorized and activities during the period. COMMON SHARES American Depository Shares [Member] Negotiable securities that represent securities of companies that are foreign to the market on which the depositary receipt (DR) trades, which are typically also disclosed/represented by certain number of underlying ordinary shares based on the depository receipt ratio in the footnote disclosure. American Depository Shares The noncash component of income tax expense for the period representing the increase (decrease) in the entity's deferred tax assets and liabilities pertaining to continuing operations. Deferred income taxes Deferred Income Tax Noncash Expense (Benefit) Income Tax Holidays [Axis] Income Tax Holidays [Domain] Description of the entity's functional currency risk policy for the conversion of Renminbi under the People's Bank of China's State Administration for Foreign Exchange. Foreign Currency Risk [Policy Text Block] Foreign Currency Risk Depreciation expenses The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation from continuing and discontinued operations. Depreciation Including Discontinued Operations The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets, including continuing and discontinued operations. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. Amortization expense Amortization of Intangible Assets Including Discontinued Operations Tabular disclosure of investments that are intended to be held for an extended period of time (longer than one operating cycle) and measured using fair value method. Schedule of Long Term Investments, Fair Value Method [Table Text Block] Schedule of long-term investments fair value option method Preferred Stock Shares Acquired Number of preferred shares acquired Represents the number of preferred shares that have been acquired during the period. Accrued Advertising, Current Accrued advertising expenses Fair Value Inputs Timing of Cash Flows Timing of cash flows Represents the timing of cash flows, used as an input to measure the fair value. Impairment Loss on Long Term Prepayment Impairment loss on long-term prepayment The loss recognized resulting from the impairment of the carrying amount of long-term prepayments. Impairment loss on long-term prepayment Payment for Issuance of Common Shares Pursuant to Stock Plan Payment for the issuance of common shares pursuant to stock plan Represents the cash outflow for the payments of the issuance of common shares pursuant to stock plan. Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments other Than Options Number of Shares Holders of which were Able to Participate in Dividend Distribution Due to Amendment in Vesting Date Number of nonvested shares, holders of which were able to participate in the dividend distribution due to amendment in vesting date Represents the number of nonvested shares, holders of which were able to participate in dividend distribution due to amendment in vesting date. Yidu Technology Group Limited [Member] Yidu Hong Kong Represents Yidu Technology Group Limited, a subsidiary of the reporting entity. Represents TAL Electronic Technology (Shanghai) Co., Ltd., a subsidiary of the reporting entity. TAL Electronic Technology Shanghai Co Ltd [Member] TAL Shanghai Beijing Xintang Sichuang Represents Beijing Xintang Sichuang Education Technology Co., Ltd., a subsidiary of the reporting entity. Beijing Xintang Sichuang Education Technology Co Ltd [Member] Accrued employee payroll and welfare benefits Accrued Employee Benefits, Current Number of businesses for which intangible assets and goodwill impairment loss recognized Represents the number of businesses for which impairment loss on intangible assets and goodwill recognized during the period. Intangible Assets and Goodwill Impairment Loss Recognized Number of Businesses Schedule of Long term Prepayments [Table] Schedule reflecting pertinent information about long-term prepayments. Long term Prepayments [Line Items] Long-term prepayments Finite Lived Intangible Assets Amortized Period Amortized period Represents information pertaining to amortized period of a finite-lived intangible asset class. Beijing Xueersi Education Technology Co Ltd and Beijing Xueersi Education Network Co Ltd [Member] Xueersi Education and Xueersi Network Represents information pertaining to Beijing Xueersi Education Technology Co., Ltd and Beijing Xueersi Network Technology Co., Ltd., an variable interest entities in which the entity has a controlling interest through contractual arrangements. Amount Payable by Variable Interest Entity Subsidiaries of Variable Interest Entity and Schools to Wholly Foreign Owned Enterprise Amount payable by VIEs and their subsidiaries and schools to the WFOE Represents the amount payable by Variable Interest Entities, their subsidiaries and schools to the wholly foreign owned enterprise. Nominee Share holders of Vies [Member] Represents the nominee shareholders of the VIEs. Nominee shareholders of the VIEs Payments to Acquire Term Deposits Purchase of term deposits The cash outflow to acquire liquid investments with original maturities of three months or more but less than a year. Income tax payable Income tax payable (including income tax payable of the consolidated VIEs without recourse to TAL Education Group of $2,165,785 and $3,661,860 as of February 28, 2013 and 2014, respectively) Accrued Income Taxes, Current Proceeds from Maturity of Deposits Proceeds from maturity of term deposits The cash inflow associated with the sale or maturity of liquid investments with original maturities of three months or more but less than a year. Represents maximum voting rights exercise by related party in any vote pertaining to the appointment or removal of a director and any matters related to the Deed. Maximum Voting Interest Percentage in Any Vote Pertaining to Any Specific Matters Related to the Deed Voting interest in any vote pertaining to the appointment, removal, or replacement of a director Represents TAL Holding Limited ("TAL Hong Kong"), a subsidiary of the reporting entity. TAL Holding Limited Hong Kong Co Ltd [Member] TAL Hong Kong Mr Bangxin Zhang Related Party [Member] Mr. Bangxin Zhang Represent information pertaining to related party Mr. Bangxin Zhang. Late payment surcharge for underpayment of income taxes due to computational errors Income Tax Late Payment Surcharge if Underpayment is Due to Computational Errors Represents the late payment surcharge for the entity's income tax returns, if there is underpayment of income taxes due to computational errors. Income Taxes Foreign Statutory Corporate Tax Rate Represents the statutory corporate income tax rate in the foreign jurisdiction. Tax rate (as a percent) Available for Sale Securities Gross Unrealized Gain Accumulated in Investments Gross unrealized gains Amount of accumulated unrealized gain before deducting unrealized loss on investments in available-for-sale securities impacting investments. Available for Sale Securities Gross Unrealized Loss Accumulated in Investments Gross unrealized (losses) Amount of accumulated unrealized loss before deducting unrealized gain on investments in available-for-sale securities impacting investments. Basic earning per share amount effect of the income tax benefit resulting from the income tax holidays granted by taxing jurisdictions. Income Tax Holiday Income Tax Benefits Basic Earnings Per Share Net income per common share-basic (in dollars per share) Income Tax Holiday Income Tax Benefits Diluted Earnings Per Share Net income per common share-diluted (in dollars per share) Diluted earning per share amount effect of the income tax benefit resulting from the income tax holidays granted by taxing jurisdictions. Loan Receivable, Current Loan receivable Carrying amount as of the balance sheet date of current loan receivable. For classified balance sheets, represents the current amount receivable, which is amounts expected to be collected within one year or the normal operating cycle, if longer. Kaoyan.com [Member] Kaoyan.com Represents information pertaining to Kaoyan.com. Shenzhen Xueersi Training Center [Member] Shenzhen Xueersi Center Represents information pertaining to Shenzhen Xueersi Training Center. Hangzhou Xueersi School Represents information pertaining to Hangzhou Xueersi Training School. Hangzhou Xueersi Training School [Member] Shanghai Putuo District Xueersi Training School [Member] Shanghai Putuo School Represents information pertaining to Shanghai Putuo District Xueersi Training School. Beijing Changping District Xueersi Training School [Member] Beijing Changping School Represents information pertaining to Beijing Changping District Xueersi Training School. Modified Award Four [Member] Amended and restated 2010 Share Incentive Plan Represents the fourth group of modified awards. Vesting Over Period from 26 January 2014 to 26 January 2023 [Member] January 26 of each year from 2014 to 2023 Represents information pertaining to the vesting period of awards over January 26 of each year from 2014 to 2023. Vesting Over Period from 26 January 2014 to 26 January 2019 [Member] January 26 of each year from 2014 to 2019 Represents information pertaining to the vesting period of awards over January 26 of each year from 2014 to 2019. Vesting Over Period from 26 January 2014 to 26 January 2017 [Member] January 26 of each year from 2014 to 2017 Represents information pertaining to the vesting period of awards over January 26 of each year from 2014 to 2017. Accrued employee annual bonus Accrued Bonuses, Current Vesting Over Period from 26 January 2015 to 26 January 2018 [Member] January 26 of each year from 2015 to 2018 Represents information pertaining to the vesting period of awards over January 26 of each year from 2015 to 2018. Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Authorized as Percent of Issued and Outstanding Shares Aggregate number of common shares that may be issued as a percent of total issued and outstanding shares Represents the aggregate number of common shares that may be issued under share-based compensation arrangement, expressed as a percent of total issued and outstanding shares. Share Based Compensation Arrangement by Share Based Payment Award Threshold Percentage of Shares Authorized Threshold percentage of share authorized Represents the threshold percentage of share authorized under the share-based compensation arrangement. Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other Than Options Grants in Period to Number of Individuals Number of individuals to whom shares are granted Represents the number of individuals to whom shares are granted under the share-based compensation arrangement. Increase (Decrease) in Long Term Debt Long-term payable The increase (decrease) during the period in the amount due for long-term debt. Proceeds from Deed Tax Refund Related to Purchase of Building Proceeds from deed tax refund related to purchase of building The cash inflow from deed tax refund related to purchase of building. Number of votes to be deducted from total issued and outstanding shares of entity held by all members, other than shares which are owned by majority shareholder for appoint or remove a director Represents the number of votes to be deducted from total issued and outstanding shares of the entity held by all members, other than shares which are owned by majority shareholder for appoint or remove a director pursuant to deed of undertaking and a side letter. Number of Votes Considered for Deduction for Appointment and Removal of Director by Shareholders Schedule of Available for Sale Securities, Current Roll Forward [Table Text Block] Schedule of available-for-sale securities measured and recorded at fair value for which there are quoted prices in active markets on a recurring basis Tabular disclosure of the change in available-for-sale securities measured and recorded at fair value for which there are quoted prices in active markets on a recurring basis. Professional service fee payable Accrued Professional Fees, Current Schedule of Long Term Investments, Fair Value Method Roll Forward [Table Text Block] Schedule of changes in the carrying amounts of long-term investments measured using fair value option method on a recurring basis Tabular disclosure of changes in the carrying amounts of long-term investments measured using fair value option method on a recurring basis. Accrued expenses Deferred Tax Assets Tax Deferred Expense Reserves and Accruals Accrued Liabilities, Current Represents the current portion of amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from accrued liabilities. Deferred Tax Assets Tax Deferred Expense Reserves and Accruals Accrued Liabilities, Noncurrent Accrued expenses Represents the non-current portion of amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from accrued liabilities. Deferred Tax Liabilities, Current [Abstract] Current deferred tax liabilities: Deed Tax Refund Receivable Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments of deed tax. Deed tax refund receivable Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Less: accumulated depreciation and amortization Unrealized gains/ (loss) on available-for-sale securities Accumulated Net Unrealized Investment Gain (Loss) [Member] Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss) [Member] Amortization period Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Acquired intangible assets, net Acquired Finite-Lived Intangible Assets [Line Items] Capital contribution Additional paid-in capital Additional Paid in Capital, Common Stock Additional paid-in capital Additional Paid-in Capital [Member] Adjustments to reconcile net income to net cash provided by operating activities Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Share-based compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Dividends to shareholders ($0.25 per common share) Cash dividend declared Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings Issuance of Class A common shares, issuance cost Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Total advertising costs Advertising Expense Advertising costs Advertising Costs, Policy [Policy Text Block] Total share-based compensation Allocated Share-based Compensation Expense Amortization of intangible assets Amortization of Intangible Assets Total of restricted net assets of Company's PRC subsidiaries, VIEs and VIEs' subsidiaries Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries Nonvested shares excluded from calculation of diluted weighted average number of common shares as their effect was anti-dilutive Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Aggregate amounts of cash and cash equivalents, term deposits and restricted cash denominated in RMB Asset, Reporting Currency Denominated, Value Impairment on long-term investments Asset Impairment Charges IMPAIRMENT LOSS ON INTANGIBLE ASSETS AND GOODWILL Asset Impairment Charges [Text Block] Assets: Assets, Fair Value Disclosure [Abstract] Total assets Assets Current assets Assets, Current [Abstract] ASSETS Assets [Abstract] Amount of remaining assets associated with discontinued operations Assets of Disposal Group, Including Discontinued Operation Total current assets Total current assets Assets, Current Total Assets, Fair Value Disclosure Schedule of available-for-sale securities measured and recorded at fair value for which there are quoted prices in active markets on a recurring basis Available-for-sale Securities [Table Text Block] Cost Available-for-sale Equity Securities, Amortized Cost Basis Available-for-sale securities Available-for-sale Securities Available-for-sales securities investments Available-for-sale securities Balance at the beginning of the period Balance at the end of the period Fair value Available for sale securities Available-for-sale Securities, Current Available-for-sales securities investments Available-for-sale Securities, Noncurrent [Abstract] Gain from sales of available-for-sale securities (includes $nil, $nil and $39,719 accumulated other comprehensive income reclassifications for unrealized gains on available-for-sale securities for years ended February 29, 2012, February 28, 2013 and February 28, 2014, respectively) Gain from sales of available-for-sale securities Available-for-sale Securities, Gross Realized Gain (Loss) Available-for-sales securities investments Available-for-sale Securities, Noncurrent Balance at the beginning of the period Balance at the end of the period Balance sheet Balance Sheet Related Disclosures [Abstract] Basis of presentation Basis of Accounting, Policy [Policy Text Block] Building Building [Member] Pro forma net income per share - diluted (in dollars per share) Business Acquisition, Pro Forma Earnings Per Share, Diluted Business Acquisition, Pro Forma Earnings Per Share, Basic Pro forma net income per share - basic (in dollars per share) Business Acquisition [Axis] Unaudited pro forma results of operations Business Acquisition, Pro Forma Information [Abstract] Schedule of unaudited pro forma results of operations Business Acquisition, Pro Forma Information [Table Text Block] Extinguishment of liabilities Business Acquisition [Line Items] Business acquisition Business combinations Pro forma net revenues Business Acquisition, Pro Forma Revenue Business Acquisition, Acquiree [Domain] Pro forma net income Business Acquisition, Pro Forma Net Income (Loss) BUSINESS ACQUISITION Total cash consideration Business Combination, Consideration Transferred BUSINESS ACQUISITION Business Combination Disclosure [Text Block] Business combinations Business Combinations Policy [Policy Text Block] Intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Purchase price allocation Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract] Total Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Payable for purchase of property and equipment Capital Expenditures Incurred but Not yet Paid Restricted cash Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Net increase/ (decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents at the end of year Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Cash and cash equivalents at the beginning of year Cash and cash equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Acquisitions of subsidiaries, cash acquired Cash Acquired from Acquisition Net cash used in investing activities-discontinued operations Cash Provided by (Used in) Investing Activities, Discontinued Operations Net cash used in operating activities-discontinued operations Cash Provided by (Used in) Operating Activities, Discontinued Operations Net cash (used in) provided by financing activities - discontinued operations Cash Provided by (Used in) Financing Activities, Discontinued Operations Common shares Class of Stock [Line Items] Class of Stock [Domain] Variable Interest Entity, Classification [Domain] COMMITMENTS AND CONTINGENCIES Commitments Contingencies and Guarantees [Text Block] COMMITMENTS AND CONTINGENCIES. Commitments and contingencies (Note16) Commitments and Contingencies Common shares, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Class A Common shares Common Class A [Member] Common share Common Stock [Member] Common shares Common Stock, Value, Issued Common shares, shares issued (in shares) Common Stock, Shares, Issued Class B Common shares Common Class B [Member] Common shares, shares authorized (in shares) Common Stock, Shares Authorized Dividends to shareholders (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Common shares, shares outstanding (in shares) Balance (in shares) Balance (in shares) Common Stock, Shares, Outstanding MAINLAND CHINA CONTRIBUTION PLAN Provision (credit) for income tax Components of Income Tax Expense (Benefit), Continuing Operations [Abstract] Significant components of the deferred tax assets and liabilities Components of Deferred Tax Assets and Liabilities [Abstract] Comprehensive income Comprehensive Income, Policy [Policy Text Block] Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Total comprehensive income Comprehensive Income [Member] Computer, network equipment and software Computer Equipment [Member] Concentration of credit risk Concentration Risk, Credit Risk, Policy [Policy Text Block] Company and its subsidiaries, excluding the Company's VIEs Consolidated Entity Excluding Variable Interest Entities (VIE) [Member] Basis of consolidation Consolidation, Policy [Policy Text Block] Consolidation of Variable Interest Entities Consolidation, Variable Interest Entity, Policy [Policy Text Block] Convertible loan Convertible loan (including convertible loan of the consolidated VIEs without recourse to TAL Education Group of nil and nil as of February 28,2010 and 2011, respectively) Convertible Debt Copyrights Copy rights Copyrights [Member] Long-term investment Cost Method Investments Cost method investments Cost Method Investments, Policy [Policy Text Block] Cost of revenues Cost of Revenue Cost of revenues Cost of Sales [Member] Current Current Income Tax Expense (Benefit), Continuing Operations [Abstract] PRC income tax expenses Current Income Tax Expense (Benefit) Customer relationship Customer Relationships [Member] CONVERTIBLE LOAN CONVERTIBLE LOAN Debt Disclosure [Text Block] Property and equipment Deferred Tax Assets, Property, Plant and Equipment Accrued ADR income Deferred Tax Liabilities, Investments Non-current deferred tax liabilities Deferred Tax Liabilities, Gross, Noncurrent Intangible assets Deferred Tax Assets, Goodwill and Intangible Assets Unrealized loss on available-for-sale securities Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross PREPAID EXPENSES AND OTHER CURRENT ASSETS Deferred Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Schedule of prepaid expenses and other current assets Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block] PRC income tax expenses Deferred Income Tax Expense (Benefit) Deferred revenue Deferred revenue (including deferred revenue of the consolidated VIEs without recourse to TAL Education Group of $67,743,448 and $102,488,333 as of February 28, 2013 and 2014, respectively) Deferred Revenue Investment loss from discontinued operations Deferred Tax Asset, Parent's Basis in Discontinued Operation Deferred tax assets-non-current Deferred Tax Assets, Net, Noncurrent Deferred tax assets-current Deferred Tax Assets, Net, Current Current deferred tax assets, net Deferred Tax Assets, Net of Valuation Allowance, Current Non-current deferred tax assets: Deferred Tax Assets, Net of Valuation Allowance, Noncurrent Classification [Abstract] Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits Accrued payroll Non-current deferred tax assets, net Deferred Tax Assets, Net of Valuation Allowance, Noncurrent Tax losses carry-forward deferred tax assets Deferred Tax Assets, Operating Loss Carryforwards Current deferred tax assets: Deferred Tax Assets, Net of Valuation Allowance, Current Classification [Abstract] Less: valuation allowance Deferred Tax Assets, Valuation Allowance, Current Less: valuation allowance Deferred Tax Assets, Valuation Allowance, Noncurrent Valuation allowance Deferred Tax Assets, Valuation Allowance Other Deferred Tax Liabilities, Other Deferred tax liabilities-non-current Deferred tax liabilities-non-current (including deferred tax liabilities-non-current of the consolidated VIEs without recourse to TAL Education Group of $36,845 and $32,344 as of February 28, 2013 and 2014, respectively) Deferred Tax Liabilities, Net, Noncurrent Non-current deferred tax liabilities: Deferred Tax Liabilities, Net, Classification [Abstract] Intangible assets Deferred Tax Liabilities, Intangible Assets Deferred Tax Liabilities, Net, Current Deferred tax liabilities -current (including deferred tax liabilities- current of the consolidated VIEs without recourse to TAL Education Group of $nil and $nil as of February 28, 2013 and 2014, respectively) Deferred tax liabilities -current Current deferred tax liabilities Provision for employee benefits under defined contribution plan Defined Contribution Plan, Cost Recognized Deposit with third parties Deposits Assets, Current Depreciation of property and equipment Depreciation Independent director Director [Member] SHARE-BASED COMPENSATION Disclosure of Compensation Related Costs, Share-based Payments [Text Block] STATUTORY RESERVES AND RESTRICTED NET ASSETS SHARE-BASED COMPENSATION. Net (loss)/income from discontinued operations, tax effects Benefits for income taxes Discontinued Operation, Tax Effect of Discontinued Operation Pre-tax loss Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax DISCONTINUED OPERATIONS Investment loss recognized on the liquidation of Qianjiang School and Jianli School Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax Summarized operating results of discontinued operations Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] Disposal Groups, Including Discontinued Operations, Name [Domain] DISCONTINUED OPERATIONS Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Net revenues Disposal Group, Including Discontinued Operation, Revenue Cash dividend declared (in dollars per share) Dividends Payable, Amount Per Share Cash dividend declared Dividends, Common Stock, Cash Staff advances Due from Employees, Current Amounts due from related parties Due from Related Parties, Current Amounts due to related parties Amounts due to related parties (including amounts due to related parties of the consolidated VIEs without recourse to TAL Education Group of nil and nil as of February 29, 2012 and February 28, 2013, respectively) Amount due to the related party Due to Related Parties, Current Net income per common share attributable to TAL Education Group shareholders-basic Earnings Per Share, Basic [Abstract] Net income per common share attributable to TAL Education Group shareholders-diluted Earnings Per Share, Diluted [Abstract] Anti-dilutive shares Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] NET INCOME PER SHARE Earnings Per Share [Text Block] Net income per share Earnings Per Share, Policy [Policy Text Block] Basic (in dollars per share) Basic (in dollars per share) Earnings Per Share, Basic Net income per common share attributable to TAL Education Group shareholders-basic (in dollars per share) Diluted (in dollars per share) Diluted (in dollars per share) Earnings Per Share, Diluted Net income per common share attributable to TAL Education Group shareholders-diluted (in dollars per share) Net income per common share NET INCOME PER SHARE Effect of exchange rate changes Effect of Exchange Rate on Cash and Cash Equivalents Income tax rate (as a percent) PRC statutory tax rate (as a percent) Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Accrued employee payroll and welfare benefits Employee-related Liabilities, Current Share-based compensation Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Unrecognized compensation expense Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options Weighted-average period over which unrecognized compensation expense will be recognized Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition TAL Education Group Shareholders' Equity Equity [Abstract] Equity method investment Equity Method Investments Equity Component [Domain] Equity method investments Equity Method Investments, Policy [Policy Text Block] Total Estimate of Fair Value Measurement [Member] Executive officers Executive Officer [Member] EXTINGUISHMENT OF LIABILITIES Measurement Frequency [Axis] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Hierarchy [Axis] Discount rate (as a percent) Fair Value Inputs, Discount Rate Recurring basis Recurring Fair Value, Measurements, Recurring [Member] Fair Value Inputs, Assets, Quantitative Information [Table Text Block] Schedule of significant unobservable inputs used to measure fair value of long-term investments Fair Value, Measurement Frequency [Domain] Fair value Fair Value Measurement, Policy [Policy Text Block] Significant unobservable inputs used to measure fair value of long-term investments Fair Value Inputs [Abstract] Fair value Information about inputs for the fair value measurements of the Group's assets that are measured at fair value on a recurring basis in periods subsequent to their initial recognition Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] FAIR VALUE Fair Value Hierarchy [Domain] Financial instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Schedule of information about inputs for the fair value measurements of the Group's assets that are measured at fair value on a recurring basis in periods subsequent to their initial recognition Fair Value, Assets Measured on Recurring Basis [Table Text Block] FAIR VALUE Fair Value Disclosures [Text Block] Level 3 Fair Value, Inputs, Level 3 [Member] Level 1 Fair Value, Inputs, Level 1 [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Amortization period Finite-Lived Intangible Asset, Useful Life Total cost of intangible assets Finite-Lived Intangible Assets, Gross Year 5 Finite-Lived Intangible Assets, Amortization Expense, Year Five Intangible assets, net Finite-Lived Intangible Assets [Line Items] Year 3 Finite-Lived Intangible Assets, Amortization Expense, Year Three Estimated amortization expenses of the existing intangible assets for the next five years Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Less: accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets by Major Class [Axis] INTANGIBLE ASSETS, NET Year 1 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months Year 4 Finite-Lived Intangible Assets, Amortization Expense, Year Four Year 2 Finite-Lived Intangible Assets, Amortization Expense, Year Two Add: foreign exchange difference Finite-Lived Intangible Assets, Translation Adjustments Foreign currency translation Foreign Currency Transactions and Translations Policy [Policy Text Block] Exchange gain (loss) Foreign Currency Transaction Gain (Loss), before Tax Exchange gain Foreign currency translation Foreign Currency Translation [Abstract] Office equipment and furniture Furniture and Fixtures [Member] Loss on disposal of property and equipment Gain (Loss) on Disposition of Property Plant Equipment Gain (Loss) on Sale of Investments Gain from sales of Century Mingde Gain from sales of Century Mingde Gain on investment of Century Mingde Gain on extinguishment of liabilities Gain on extinguishment of liabilities Gains (Losses) on Extinguishment of Debt General and administrative General and Administrative Expense General and administrative General and Administrative Expense [Member] Impairment loss on intangible assets and goodwill Impairment loss on intangible assets and goodwill Impairment Goodwill and Intangible Asset Impairment Charge for the year Impairment loss for the goodwill Goodwill, Impairment Loss GOODWILL Acquired intangible assets, net Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block] Goodwill Beginning balance Ending balance Goodwill, net Goodwill. Exchange difference Goodwill, Translation Adjustments Goodwill Goodwill [Line Items] GOODWILL Goodwill Disclosure [Text Block] Beginning balance Ending balance Goodwill, Impaired, Accumulated Impairment Loss Goodwill Goodwill [Roll Forward] Beginning balance Ending balance Goodwill, Gross Addition Goodwill, Acquired During Period Goodwill Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Gross profit Gross Profit Impairment loss on long-term investment Impairment loss on long-term investment Other than Temporary Impairment Losses, Investments Impairment on long-term investments Impairment of long-lived assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Impairment loss for the intangible assets Impairment of Intangible Assets, Finite-lived Basic from continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Basic Share Net income from continuing operations Net income from continuing operations Income (Loss) from Continuing Operations Attributable to Parent Diluted from discontinued operations (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share CONSOLIDATED STATEMENTS OF OPERATIONS Income before income tax provision Net income before provision for income tax Assessable income Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income Statement Location [Axis] INCOME TAXES Income Tax Authority [Domain] Disposal Group Name [Axis] Discontinued operations Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Diluted from continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share Income Tax Authority [Axis] INCOME TAXES Income Tax Disclosure [Text Block] Income Statement Location [Domain] Basic from discontinued operations (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Table] Income Tax Holiday [Table] Provision for income tax (includes $nil, $nil and $13,239 income tax expenses from reclassification items for years ended February 29, 2012, February 28, 2013 and February 28, 2014, respectively) Total Provision for profits tax Income Tax Expense (Benefit) Change in valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Increase in income tax expenses Income Tax Holiday, Aggregate Dollar Amount Net income per common share (in dollars per share) Income Tax Holiday, Income Tax Benefits Per Share Reconciliation of the PRC statutory tax rate to the effective tax rate Effective Income Tax Rate Reconciliation, Amount [Abstract] Increase in income tax expenses and net income per share amounts Income Tax Holiday [Line Items] Income tax paid Income Taxes Paid Deed tax refund receivable Income Taxes Receivable, Current Income tax receivable Expenses not deductible Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount Net loss from discontinued operations, net of tax effects of $81,391, $nil and $nil for years ended February 28, 2011, February 29, 2012 and February 28, 2013, respectively Net loss from discontinued operations Net loss Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Income tax at statutory tax rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Income taxes Income Tax, Policy [Policy Text Block] Effect of income tax exemptions Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount Effect of income tax rate difference in other jurisdictions Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount Income tax payable Increase (Decrease) in Income Taxes Payable Rental deposit Increase (Decrease) in Deposits Outstanding Accounts payable Increase (Decrease) in Accounts Payable Amounts due from related parties Increase (Decrease) in Due from Related Parties, Current Accrued expenses and other current liabilities Increase (Decrease) in Accrued Liabilities Deferred revenue Increase (Decrease) in Deferred Revenue Changes in operating assets and liabilities Increase (Decrease) in Operating Capital [Abstract] Inventory Increase (Decrease) in Inventories Amounts due to related parties Increase (Decrease) in Due to Related Parties Income tax receivable Increase (Decrease) in Income Taxes Receivable Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Restricted cash Increase (Decrease) in Restricted Cash Increase (Decrease) in Stockholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Dilutive effect of non-vested shares award Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Dilutive effect of preferred shares Incremental Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock Intangible assets, net Intangible assets, net Intangible Assets, Net (Excluding Goodwill) INTANGIBLE ASSETS, NET Intangible Assets Disclosure [Text Block] Interest expense Interest Expense Interest income Interest Income and Fees, Bankers Acceptances, Certificates of Deposit and Commercial Paper Interest expense paid Interest Paid Term deposits Interest-bearing Deposits in Banks and Other Financial Institutions Interest receivable Interest Receivable, Current Domain names Internet Domain Names [Member] Inventory Inventory, Net Schedule of long-term investments Investment Holdings, Schedule of Investments [Table Text Block] LONG-TERM INVESTMENTS Investment Holdings, Schedule of Investments [Text Block] AVAILABLE-FOR-SALE SECURITIES. AVAILABLE-FOR-SALE SECURITIES Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Rental expense under operating leases Operating Leases, Rent Expense Operating leases Lease, Policy [Policy Text Block] Leasehold improvement Leasehold Improvements [Member] Total current liabilities Total current liabilities Liabilities, Current Total liabilities and equity Liabilities and Equity Current liabilities Liabilities [Abstract] Total non-current liabilities Liabilities, Noncurrent Total liabilities Liabilities Amount of remaining liabilities associated with discontinued operations Liabilities of Disposal Group, Including Discontinued Operation LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Education license Licensing Agreements [Member] Long-term investments Long-term investment Long-term Investments Total Long-term investments Long-term Investments [Abstract] Long-term Debt, Excluding Current Maturities Long-term payable (including long-term payable of the consolidated VIEs without recourse to TAL Education Group of $nil and $813,696 as of February 28, 2013 and 2014, respectively) Long-term payable Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Available-for-sale securities Marketable Securities, Available-for-sale Securities, Policy [Policy Text Block] Advertising costs Marketing and Advertising Expense [Abstract] Maximum Maximum [Member] Minimum Minimum [Member] Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Less: cash and cash equivalents of discontinued operation at the end of year Net Cash Provided by (Used in) Discontinued Operations Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Cash and cash equivalents of continuing operations at the end of year Net Cash Provided by (Used in) Continuing Operations Net income attributable to TAL Education Group shareholders Net Income (Loss) Available to Common Stockholders, Basic Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations Net cash provided by operating activities Net cash used in financing activities Net cash (used in) / provided by financing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net cash used in investing activities Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Net cash used in / (provided by) investing activities Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations Net cash (used in) / provided by investing activities Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Net cash provided by operating activities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Net income Net income Net Income (Loss) Attributable to Parent Recent accounting pronouncements adopted and not yet adopted New Accounting Pronouncements, Policy [Policy Text Block] Non-cash investing and financing activities: Noncash Investing and Financing Items [Abstract] Payable for investment in Holiday School Noncash or Part Noncash Acquisition, Payables Assumed Non-compete agreement Noncompete Agreements [Member] Number of reportable segments Number of Reportable Segments Officer Officer [Member] Future minimum payments under non-cancellable operating leases Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Operating expenses Operating Expenses [Abstract] February 2018 Operating Leases, Future Minimum Payments, Due in Four Years Total operating expenses Operating Expenses February 2017 Operating Leases, Future Minimum Payments, Due in Three Years February 2015 Operating Leases, Future Minimum Payments Due, Next Twelve Months Income from operations Operating Income (Loss) February 2016 Operating Leases, Future Minimum Payments, Due in Two Years Total Operating Leases, Future Minimum Payments Due Tax loss carry-forward Operating Loss Carryforwards ORGANIZATION AND PRINCIPAL ACTIVITIES ORGANIZATION AND PRINCIPAL ACTIVITIES Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] SIGNIFICANT ACCOUNTING POLICIES Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Unrealized (loss)/ gains on available-for-sale securities: Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments, Net of Tax [Abstract] Transfer to the statements of operations of other-than-temporary impairment, net of tax effect of ($96,557) Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Net of Tax, Portion Attributable to Parent, Available-for-sale Securities Tax effect of transfers to statements of operations of realized gains on available-for-sale securities Income tax expenses from reclassification items securities, tax effects Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Transfer to statements of operations of realized gains on available for sale securities, net of tax effect of $13,239 Less: Transfer to statements of operations of realized gains on available-for-sale securities, net of tax effect of $nil, $nil and $13,239 for years ended February 29, 2012, February 28, 2013 and February 28, 2014 Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Accumulated other comprehensive income reclassifications for unrealized gains on available-for-sale securities Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Impairment loss on available-for-sale securities Impairment loss on available-for-sale securities Other than Temporary Impairment Losses, Investments, Available-for-sale Securities Transfer to the statements of operations of other-than-temporary impairment, tax effect Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Tax, Portion Attributable to Parent, Available-for-sale Securities Other non-current assets Other Assets, Noncurrent PREPAID EXPENSES AND OTHER CURRENT ASSETS Other Assets Disclosure [Text Block] Others Other Assets, Current Net unrealized gains/ (loss) on available-for-sale securities, net of tax effect of $30,474, $(8,583) and $(6,615) for years ended February 29, 2012, February 28, 2013 and February 28, 2014 Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Net unrealized gains (loss) on available-for-sale securities, net of tax effect of $(6,615), $(8,583), and $30,474 for the year ended 2014, 2013 and 2012 respectively Tax effect of net unrealized (loss)/gains on available-for-sale securities Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax Other income Other Nonoperating Income (Expense) Others Other Liabilities, Current Other comprehensive income, net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Foreign currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Other comprehensive income Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Products and Services [Domain] Partnership agreement Partnership [Member] ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES Dividend to shareholders Payments for Repurchase of Initial Public Offering Payment for share repurchase Payments for Repurchase of Common Stock Cash consideration Payments to Acquire Long-term Investments Loan to a third party Payments to Acquire Loans Receivable Payment for acquisition of Kaoyan.com (net of cash acquired of $nil) Payments to Acquire Businesses, Net of Cash Acquired Payment for long-term investment in BabyTree Inc. Payments to Acquire Available-for-sale Securities Purchase Purchase of property and equipment Purchase of property and equipment Payments to Acquire Property, Plant, and Equipment Payment for long-term investment in BabyTree Inc. Payments to Acquire Available-for-sale Securities, Equity Payment of issuance cost in connection with IPO Payments of Stock Issuance Costs Distribution to shareholders Distribution to shareholders Payments of Capital Distribution Payment for other long-term investments Payments to Acquire Other Investments Cash dividend paid Payments of Dividends Dividend to shareholders Purchase of intangible assets Payments to Acquire Intangible Assets Payment of deferred acquisition consideration Payments for Previous Acquisition MAINLAND CHINA CONTRIBUTION PLAN Pension and Other Postretirement Benefits Disclosure [Text Block] CONVERTIBLE REDEEMABLE PREFERRED SHARES Preferred Stock [Text Block] Long-term prepayments Total Prepaid Expense Other, Noncurrent Prepaid Rent Prepaid Rent Prepaid expenses and other current assets Total Prepaid Expense and Other Assets, Current Capital contributed from shareholders Contribution from founding shareholders Proceeds from Contributed Capital Payback of convertible loan Proceeds from (Repayments of) Other Long-term Debt Portion of the total purchase price received in the process of redemption of the investment Proceeds from Sale of Long-term Investments Class B common shares subscription received Proceeds from Issuance of Private Placement Proceeds from initial public offering Proceeds from Issuance Initial Public Offering Proceeds from issuance of Series A convertible redeemable preferred shares, net of issuance cost of $113,035 Proceeds from Issuance of Redeemable Convertible Preferred Stock Proceeds from sales of investment in Century Mingde Proceeds from Sale and Maturity of Other Investments Proceeds from sales of available-for-sale securities Disposed Proceeds from Sale of Available-for-sale Securities Disposal Proceeds from Sale of Property, Plant, and Equipment Proceeds from disposal of property and equipment Products and Services [Axis] Estimated useful lives Property, Plant and Equipment, Useful Life Total cost of property and equipment Property, Plant and Equipment, Gross Property and equipment, net Property, Plant and Equipment, Policy [Policy Text Block] Property and equipment, net Property and equipment, net Property, Plant and Equipment, Net PROPERTY AND EQUIPMENT, NET Schedule of estimated useful lives of property and equipment Property, Plant and Equipment [Table Text Block] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Axis] PROPERTY AND EQUIPMENT, NET Property, Plant and Equipment Disclosure [Text Block] Property and equipment, net Property, Plant and Equipment [Line Items] Range [Axis] Range [Domain] Class B common shares subscription receivable Receivable from Shareholders or Affiliates for Issuance of Capital Stock Series A convertible redeemable preferred shares Redeemable Convertible Preferred Stock [Member] RELATED PARTY TRANSACTIONS Related Party Transactions Disclosure [Text Block] Related party transactions Related Party Transaction [Line Items] Related Party [Axis] Related Party [Domain] RELATED PARTY TRANSACTIONS Payment for previous acquisition Repayments of Related Party Debt Restricted cash-current Restricted Cash and Cash Equivalents Non-vested shares Restricted Stock [Member] Restricted cash-non-current Restricted Cash and Cash Equivalents, Noncurrent Statutory reserve Retained Earnings, Appropriated [Member] Retained earnings Retained Earnings [Member] Retained earnings Retained Earnings (Accumulated Deficit) Revenue Recognition, Multiple-deliverable Arrangements [Table] Revenue recognition Revenue Recognition, Policy [Policy Text Block] Revenue recognition Revenue Recognition, Multiple-deliverable Arrangements [Line Items] Net revenues Net revenue Revenue, Net Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Schedule of purchase price allocation Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Schedule of Available-for-sale Securities [Table] Schedule of Investments [Table] Summary of activities of non-vested shares granted under the 2010 Share Incentive Plan Schedule of Nonvested Share Activity [Table Text Block] Schedule of amortization periods by major intangible asset classes Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block] Schedule of provision (credit) for income tax Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of reconciliation between the provision for income taxes computed by applying the PRC EIT rates of 25% to income before income taxes and the actual provision for income tax Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of significant components of the deferred tax assets and liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of Finite-Lived Intangible Assets [Table] Schedule of future minimum payments under non-cancellable operating leases Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Schedule of amount due to the founding shareholder Schedule of Related Party Transactions [Table Text Block] Schedule of net income per share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] LONG-TERM INVESTMENTS. Long-term investments Schedule of Investments [Line Items] Schedule of intangible assets, net Schedule of Finite-Lived Intangible Assets [Table Text Block] Available-for-sale securities Schedule of Available-for-sale Securities [Line Items] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of additional information concerning the Group's available-for-sale securities Schedule of Available-for-sale Securities Reconciliation [Table Text Block] Summary of operating results as discontinued operations in accompanying consolidated statements of operations Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Investment, Name [Axis] Summary of share-based compensation Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] Schedule of changes in the carrying amount of goodwill Schedule of Goodwill [Table Text Block] Schedule of Goodwill [Table] Schedule of Related Party Transactions, by Related Party [Table] Property, Plant and Equipment [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Stock by Class [Table] Schedule of consolidated financial statement balances and amounts of the Company's VIEs and their subsidiaries and schools included in the consolidated financial statements after the elimination of intercompany balances and transactions Schedule of Variable Interest Entities [Table Text Block] Schedule of Variable Interest Entities [Table] Rental deposit Security Deposit SEGMENT INFORMATION SEGMENT INFORMATION Segment Reporting Disclosure [Text Block] Selling and marketing Selling and Marketing Expense Selling and marketing Selling and Marketing Expense [Member] Series A preferred shares Additional disclosures Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] Number of nonvested shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Number of nonvested shares granted Fair value per non-vested share granted (in dollars per share) Estimated fair value of the ordinary share on the grant date (in dollars per share) Granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Outstanding at the end of the period (in shares) Outstanding at the beginning of the period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Vested (in shares) Vesting of nonvested shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Share-based compensation Share-based Compensation Vesting period Vesting period of nonvested shares Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Weighted average grant date fair value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Share-based compensation Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Outstanding at the beginning of the period (in dollars per share) Outstanding at the end of the period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures Issuance of common shares pursuant to stock plan (in shares) Total fair value of non-vested shares vested during the period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Maximum aggregate number of shares which may be issued pursuant to all awards Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Share-based compensation Number of independent directors and employees affected by modification Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Number of Employees Affected Equity Award [Domain] Aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Statement [Table] Statement Statement [Line Items] CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY CONSOLIDATED STATEMENTS OF CASH FLOWS Equity Components [Axis] CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME CONSOLIDATED BALANCE SHEETS Class of Stock [Axis] Statutory reserve Statutory Accounting Practices, Statutory Capital and Surplus, Balance Share repurchase Stock Repurchased and Retired During Period, Value Stock Repurchased and Retired During Period, Value Shares issued related to vesting and conversion of non-vested shares Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Conversion of Series A convertible redeemable prefer shares upon initial public offering Stock Issued During Period, Value, Conversion of Convertible Securities Issuance of common shares pursuant to stock plan Stock Granted, Value, Share-based Compensation, Net of Forfeitures Common shares were cancelled upon the completion of the share repurchase Share repurchase (in shares) Stock Repurchased and Retired During Period, Shares Issuance of Class A common shares, net of issuance cost of $(2,430,995) (in shares) Shares issued Stock Issued During Period, Shares, New Issues Capital contribution Stock Issued During Period, Value, Other Conversion of Series A convertible redeemable prefer shares upon initial public offering (in shares) Common shares issued due to conversion of convertible shares Stock Issued During Period, Shares, Conversion of Convertible Securities Issuance of Class A common shares, net of issuance cost of $(2,430,995) Stock Issued During Period, Value, New Issues Equity Stockholders' Equity Attributable to Parent [Abstract] Total TAL Education Group's Equity Balance Balance Stockholders' Equity Attributable to Parent COMMON SHARES SUBSEQUENT EVENTS Subsequent Events [Text Block] SUBSEQUENT EVENTS Subsequent Event [Table] Subsequent events Subsequent Event [Line Items] Subsequent events Subsequent Event [Member] Subsequent Event Type [Domain] Subsequent Event Type [Axis] Percentage of economic ownership of subsidiaries Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions Schedule of the increase in income tax expenses and net income per share amounts if Xueersi Education, Yidu Huida, TAL Beijing and Beijing Xintang Sichuang were not in a tax holiday period Summary of Income Tax Holiday [Table Text Block] Supplement disclosure of cash flow information: Supplemental Cash Flow Information [Abstract] Series A convertible redeemable preferred shares, share outstanding (in shares) Temporary Equity, Shares Outstanding Series A convertible redeemable preferred shares, par value (in dollars per share) Temporary Equity, Par or Stated Value Per Share Series A convertible redeemable preferred shares, share authorized (in shares) Temporary Equity, Shares Authorized CONVERTIBLE REDEEMABLE PREFERRED SHARES Accretion for Series A convertible redeemable preferred share redemption premium Temporary Equity, Accretion to Redemption Value Series A convertible redeemable preferred shares, share issued (in shares) Temporary Equity, Shares Issued Series A convertible redeemable preferred shares, Liquidation preference Temporary Equity, Liquidation Preference Deemed dividends on Series A convertible redeemable preferred shares-accretion of redemption premium Temporary Equity, Accretion to Redemption Value, Adjustment Title of Individual [Axis] Relationship to Entity [Domain] Trade name Trade Names [Member] Use of estimates Use of Estimates, Policy [Policy Text Block] Vesting [Axis] Vesting [Domain] VAT refund receivable Value Added Tax Receivable, Current Variable Interest Entities [Axis] Variable Interest Entity Variable Interest Entity, Primary Beneficiary [Member] Consolidation of Variable Interest Entities Variable Interest Entity [Line Items] Percentage of economic ownership of VIE and its subsidiaries Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage VIEs Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] Vehicles Vehicles [Member] Weighted average shares used in calculating net income per common share Weighted Average Number of Shares Outstanding, Diluted [Abstract] Shares (denominator): Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Basic (in shares) Weighted average shares outstanding Basic Weighted Average Number of Shares Outstanding, Basic Diluted (in shares) Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted