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ORDINARY SHARES AND STATUTORY RESERVE (Ordinary Shares) (Details) ¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |
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Apr. 03, 2014 shares | Dec. 10, 2013 shares | Apr. 09, 2013 CNY (¥) ¥ / shares shares | May 31, 2016 CNY (¥) | Dec. 16, 2008 shares | Jan. 16, 2004 CNY (¥) ¥ / shares shares | Dec. 31, 2016 CNY (¥) shares | Dec. 31, 2015 CNY (¥) shares | Dec. 31, 2014 CNY (¥) shares | Dec. 31, 2016 $ / shares shares | Mar. 07, 2016 $ / shares | Dec. 31, 2015 $ / shares | Dec. 31, 2014 $ / shares shares | Apr. 30, 2014 $ / shares | Feb. 27, 2014 $ / shares shares | Dec. 31, 2013 shares | Dec. 15, 2008 shares | Oct. 08, 2003 USD ($) $ / shares shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized share capital | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 150
Conversion ratio |  |  |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares authorized | shares |  |  |  |  | 90,000,000 |  |  |  |  |  |  |  |  |  | 1,000,000,000 |  | 9,000,000 | 90,000,000
Ordinary shares, par value | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.001 |  |  | $ 0.001
Ordinary shares issued | shares |  |  |  |  | 13,580,000 |  |  |  |  |  |  |  |  |  |  |  | 1,358,000 |
Ordinary shares outstanding | shares |  |  |  |  | 13,580,000 |  |  |  |  |  |  |  |  |  |  |  | 1,358,000 |
Preferred shares authorized | shares |  |  |  |  | 60,000,000 |  |  |  |  |  |  |  |  |  |  |  | 6,000,000 | 60,000,000
Preferred shares, par value | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.001
Preferred shares issued | shares |  |  |  |  | 15,891,250 |  |  |  |  |  |  |  |  |  |  |  | 1,589,125 |
Preferred shares outstanding | shares |  |  |  |  | 15,891,250 |  |  |  |  |  |  |  |  |  |  |  | 1,589,125 |
Value of shares issued in IPO |  |  |  |  |  |  |  |  | ¥ 567,360 |  |  |  |  |  |  |  |  |
Value of shares issued in Private Placement |  |  |  |  |  |  |  |  | 83,052 |  |  |  |  |  |  |  |  |
Stock issuance costs |  |  |  |  |  |  |  |  | 24,801 |  |  |  |  |  |  |  |  |
Share price | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 8.60 |  |  |  |  |
Reclassification of the balances between additional paid-in capital and accumulated deficit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares issued upon exercise of share options and vesting of non-vested shares | shares |  |  |  |  |  |  | 2,106,043 | 3,015,872 | 1,786,449 |  |  |  |  |  |  |  |  |
Total consideration of Shares repurchased |  |  |  |  |  |  | ¥ 44,406 | ¥ 49,355 |  |  |  |  |  |  |  |  |  |
Dividends Payable, Amount Per Share | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 0.15 |  |  |  |  |  |  |
Dividends, Common Stock, Cash |  |  |  | ¥ 54,026 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Techedu Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 19.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term |  |  | 30 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  | ¥ 31,320 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares issued in IPO |  |  |  |  |  |  |  |  | ¥ 71 |  |  |  |  |  |  |  |  |
Value of shares issued in Private Placement |  |  |  |  |  |  |  |  | 9 |  |  |  |  |  |  |  |  |
Ordinary Shares [Member] | GF Tarena Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued during period | shares |  |  | 916,848 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares issued during period |  |  | ¥ 25,056 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price | ¥ / shares |  |  | ¥ 27.33 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional Paid-in Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares issued in IPO |  |  |  |  |  |  |  |  | 567,289 |  |  |  |  |  |  |  |  |
Value of shares issued in Private Placement |  |  |  |  |  |  |  |  | 83,043 |  |  |  |  |  |  |  |  |
Reclassification of the balances between additional paid-in capital and accumulated deficit |  |  |  |  |  |  |  |  | (526,457) |  |  |  |  |  |  |  |  |
Total consideration of Shares repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained Earnings (Accumulated Deficit) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares issued in IPO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares issued in Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification of the balances between additional paid-in capital and accumulated deficit |  |  |  |  |  |  |  |  | 526,457 |  |  |  |  |  |  |  |  |
Total consideration of Shares repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares issued in IPO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares issued in Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification of the balances between additional paid-in capital and accumulated deficit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase plan, authorized amount |  |  |  |  |  |  |  | ¥ 133,556 |  |  |  |  |  |  |  |  |  |
Shares repurchased | shares |  |  |  |  |  |  | 648,867 | 926,113 |  |  |  |  |  |  |  |  |  |
Total consideration of Shares repurchased |  |  |  |  |  |  | ¥ 44,406 | ¥ 49,355 |  |  |  |  |  |  |  |  |  |
Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares authorized | shares |  |  |  |  |  |  |  | 860,000,000 |  | 860,000,000 |  |  |  |  | 860,000,000 |  |  |
Ordinary shares, par value | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.001 |  | $ 0.001 |  |  |  |  |  |
Ordinary shares issued | shares |  |  |  |  |  |  |  | 44,914,538 |  | 48,735,228 |  |  |  |  |  |  |  |
Ordinary shares outstanding | shares |  |  |  |  |  |  |  | 43,988,425 |  | 47,160,248 |  |  |  |  |  |  |  |
Conversion of Class B ordinary shares into shares | shares |  |  |  |  |  |  | 1,679,647 | 18,158,128 | 8,924,365 |  |  |  |  |  |  |  |  |
Ordinary shares issued upon exercise of share options and vesting of non-vested shares | shares |  |  |  |  |  |  | 2,141,043 | 3,043,652 | 1,788,393 |  |  |  |  |  |  |  |  |
Class A [Member] | Ordinary Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares, par value | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.001 |  |  |  |  |
Ordinary shares issued | shares |  |  |  |  |  |  |  | 44,914,538 |  | 48,735,228 |  |  | 23,712,758 |  |  |  |  |
Shares issued during period | shares |  |  |  |  |  |  |  |  | 11,500,000 |  |  |  |  |  |  |  |  |
Value of shares issued in IPO |  |  |  |  |  |  |  |  | ¥ 71 |  |  |  |  |  |  |  |  |
Shares issued in Private Placement | shares |  |  |  |  |  |  |  |  | 1,500,000 |  |  |  |  |  |  |  |  |
Value of shares issued in Private Placement |  |  |  |  |  |  |  |  | ¥ 9 |  |  |  |  |  |  |  |  |
Conversion of convertible redeemable preferred shares to ordinary shares, shares | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 9.00 |  |  |  |  |
Reclassification of the balances between additional paid-in capital and accumulated deficit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration of Shares repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A [Member] | Ordinary Shares [Member] | New Oriental Education Technology Group Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares, par value | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.001 |  |  |  |
Shares issued in Private Placement | shares |  |  |  |  |  |  |  |  | 1,500,000 |  |  |  |  |  |  |  |  |
Share price | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 9.00 |  |  |  |  |
Class B [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares authorized | shares |  |  |  |  |  |  |  | 40,000,000 |  | 40,000,000 |  |  |  |  | 40,000,000 |  |  |
Ordinary shares, par value | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.001 |  | $ 0.001 |  |  |  |  |  |
Ordinary shares issued | shares |  |  |  |  |  |  |  | 10,574,896 |  | 8,895,249 |  |  |  |  |  |  |  |
Ordinary shares outstanding | shares |  |  |  |  |  |  |  | 10,574,896 |  | 8,895,249 |  |  |  |  |  |  |  |
Class B [Member] | Ordinary Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares issued | shares |  |  |  |  |  |  |  | 10,574,896 |  | 8,895,249 |  |  | 28,733,024 |  |  | 12,226,558 |  |
Value of shares issued in IPO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued in Private Placement | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares issued in Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of convertible redeemable preferred shares to ordinary shares, shares | shares | 25,430,831 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification of the balances between additional paid-in capital and accumulated deficit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration of Shares repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserved Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares authorized | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |
Series A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued during period | shares |  |  |  |  |  | 8,571,430 |  |  |  |  |  |  |  |  |  |  |  |
Value of shares issued during period |  |  |  |  |  | ¥ 4,138 |  |  |  |  |  |  |  |  |  |  |  |
Share price | ¥ / shares |  |  |  |  |  | ¥ 0.48 |  |  |  |  |  |  |  |  |  |  |  |
Series A [Member] | Techedu Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued during period | shares |  |  | 1,146,059 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares issued during period |  |  | ¥ 31,320 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of convertible redeemable preferred shares to ordinary shares, shares | shares |  | 1,146,059 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price | ¥ / shares |  |  | ¥ 27.33 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series A [Member] | GF Tarena Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued during period | shares |  |  | 229,212 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares issued during period |  |  | ¥ 6,264 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of convertible redeemable preferred shares to ordinary shares, shares | shares |  | 229,212 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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