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LONG-TERM DEBT (Details) $ / shares in Units, shares in Millions |  |  |  | 9 Months Ended | 36 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 24, 2015 USD ($) $ / shares shares | Oct. 17, 2013 USD ($) $ / shares shares | Sep. 24, 2012 USD ($) $ / shares shares | Sep. 30, 2015 USD ($) $ / shares shares | Sep. 30, 2015 CNY (¥) shares | Sep. 30, 2014 USD ($) shares | Sep. 30, 2014 CNY (¥) shares | Sep. 30, 2015 USD ($) | Sep. 30, 2015 CNY (¥) | May. 26, 2015 USD ($) $ / shares | Dec. 31, 2014 CNY (¥) | Aug. 07, 2014 USD ($) $ / shares
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Value of the Notes |  |  |  | $ 2,650,000,000 |  |  |  | $ 2,650,000,000 | ¥ 16,842,340,000 |  | ¥ 8,065,980,000 |
Amount of notes tendered |  |  |  | 4,195,944 | ¥ 26,667,740 |  | ¥ 110,815,452 |  |  |  |  |
Proceeds from issuance of convertible debt |  |  |  | 1,299,389,515 | 8,258,400,000 |  | ¥ 3,069,000,000 |  |  |  |  |
Proceeds from sale of warrants |  |  |  | $ 82,353,200 | ¥ 523,404,000 |  |  |  |  |  |  |
Priceline Group |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Period that lender may purchase shares in the open market (in months) |  |  |  | 12 months | 12 months |  |  |  |  |  |  |
Maximum percentage of outstanding shares to be held by lender |  |  |  | 15.00% |  |  |  | 15.00% | 15.00% |  |  |
2020 Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Value of the Notes |  |  |  | $ 700,000,000 |  |  |  | $ 700,000,000 | ¥ 4,448,920,000 |  |  |
Aggregate principle amount | $ 700,000,000 |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 1.00% |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of convertible debt | $ 689,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs | 11,300,000 |  |  |  |  |  |  |  |  |  |  |
Percentage of principal amount at which the entity may be required to repurchase debt under contingent option |  |  |  | 100.00 | 100.00 |  |  |  |  |  |  |
Beneficial conversion feature | $ 0 |  |  |  |  |  |  |  |  |  |  |
Percentage of principal amount at which the entity is required to repurchase debt under non-contingent option |  |  |  | 100.00 | 100.00 |  |  |  |  |  |  |
2020 Convertible Senior Notes | ADS |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Initial conversion rate | 0.0091942 |  |  |  |  |  |  |  |  |  |  |
Initial conversion price (in dollars per share) | $ / shares | $ 108.76 |  |  |  |  |  |  |  |  |  |  |
Increased initial conversion price, after effect of call option and warrants (in dollars per share) | $ / shares |  |  |  | $ 135.02 |  |  |  |  |  |  |  |
2020 Convertible Senior Notes | ADS | Long | Maximum |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Number of shares agreed to be sold by the counterparty on exercise of Purchased Call option | shares | 6.4 |  |  |  |  |  |  |  |  |  |  |
2020 Convertible Senior Notes | ADS | Sold Warrants |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of warrants | $ 84,400,000 |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants sold (in dollars per share) | $ / shares | $ 135.02 |  |  |  |  |  |  |  |  |  |  |
Expected life of warrants | 5 years |  |  |  |  |  |  |  |  |  |  |
2020 Convertible Senior Notes | ADS | Sold Warrants | Maximum |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Number of shares that can be purchased from warrants sold | shares | 6.4 |  |  |  |  |  |  |  |  |  |  |
2025 Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Value of the Notes |  |  |  | $ 400,000,000 |  |  |  | 400,000,000 | 2,542,240,000 |  |  |
Aggregate principle amount | $ 400,000,000 |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 1.99% |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of convertible debt | $ 393,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs | 6,800,000 |  |  |  |  |  |  |  |  |  |  |
Percentage of principal amount at which the entity may be required to repurchase debt under contingent option |  |  |  | 100.00 | 100.00 |  |  |  |  |  |  |
Beneficial conversion feature | $ 0 |  |  |  |  |  |  |  |  |  |  |
Percentage of principal amount at which the entity is required to repurchase debt under non-contingent option |  |  |  | 100.00 | 100.00 |  |  |  |  |  |  |
2025 Convertible Senior Notes | ADS |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Initial conversion rate | 0.0935550 |  |  |  |  |  |  |  |  |  |  |
Initial conversion price (in dollars per share) | $ / shares | $ 106.89 |  |  |  |  |  |  |  |  |  |  |
Priceline Convertible Notes I |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Value of the Notes | ¥ |  |  |  |  |  |  |  |  | 3,177,800,000 |  | 3,102,300,000 |
Aggregate principle amount |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 1.00%
Priceline Convertible Notes II |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Value of the Notes | ¥ |  |  |  |  |  |  |  |  | 1,588,900,000 |  |  |
Aggregate principle amount |  |  |  |  |  |  |  |  |  | $ 250,000,000 |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  | 1.00% |  |
Priceline Convertible Notes II | ADS |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Initial conversion price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 104.27 |  |
2017 Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Value of the Notes |  |  |  | $ 65,000,000 |  |  |  | 65,000,000 | 411,525,100 |  | 428,427,630 |
Aggregate principle amount |  |  | $ 180,000,000 |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 0.50% |  |  |  |  |  |  |  |  |
Proceeds from early termination of call option |  |  |  |  |  |  |  | 11,600,000 |  |  |  |
Proceeds from issuance of convertible debt |  |  | $ 175,000,000 |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  | $ 5,400,000 |  |  |  |  |  |  |  |  |
Percentage of principal amount at which the entity may be required to repurchase debt under contingent option |  |  |  | 1.00 | 1.00 |  |  |  |  |  |  |
Percentage of principal amount at which the entity is required to repurchase debt under non-contingent option |  |  |  | 1.00 | 1.00 |  |  |  |  |  |  |
2017 Convertible Senior Notes | ADS |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Initial conversion rate |  |  | 0.0517116 | 0.0517116 | 0.0517116 | 0.0517116 | 0.0517116 |  |  |  |  |
Initial conversion price (in dollars per share) | $ / shares |  |  | $ 19.34 |  |  |  |  |  |  |  |  |
Amount of notes tendered |  |  |  | $ 4,300,000 |  | $ 18,000,000 |  |  |  |  |  |
Number of instruments | shares |  |  |  | 0.2 | 0.2 | 0.9 | 0.9 |  |  |  |  |
Increased initial conversion price, after effect of call option and warrants (in dollars per share) | $ / shares |  |  |  | $ 26.37 |  |  |  |  |  |  |  |
2017 Convertible Senior Notes | ADS | Minimum |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Percentage of cash incentive |  |  | 1.50% |  |  |  |  |  |  |  |  |
2017 Convertible Senior Notes | ADS | Maximum |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Percentage of cash incentive |  |  | 2.00% |  |  |  |  |  |  |  |  |
2017 Convertible Senior Notes | ADS | Written call option | Long | Maximum |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Number of shares agreed to be sold by the counterparty on exercise of Purchased Call option | shares |  |  | 9.3 |  |  |  |  |  |  |  |  |
2017 Convertible Senior Notes | ADS | Sold Warrants |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of warrants |  |  | $ 26,600,000 |  |  |  |  |  |  |  |  |
Exercise price of warrants sold (in dollars per share) | $ / shares |  |  | $ 26.37 |  |  |  |  |  |  |  |  |
Expected life of warrants |  |  | 5 years |  |  |  |  |  |  |  |  |
2017 Convertible Senior Notes | ADS | Sold Warrants | Maximum |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Number of shares that can be purchased from warrants sold | shares |  |  | 9.3 |  |  |  |  |  |  |  |  |
2018 Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Value of the Notes |  |  |  | $ 800,000,000 |  |  |  | $ 800,000,000 | ¥ 5,084,480,000 |  | ¥ 4,963,680,000 |
Aggregate principle amount |  | $ 800,000,000 |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 1.25% |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of convertible debt |  | $ 780,000,000 |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  | 19,600,000 |  |  |  |  |  |  |  |  |  |
Percentage of principal amount at which the entity may be required to repurchase debt under contingent option |  |  |  | 1.00 | 1.00 |  |  |  |  |  |  |
Beneficial conversion feature |  | $ 0 |  |  |  |  |  |  |  |  |  |
Percentage of principal amount at which the entity is required to repurchase debt under non-contingent option |  |  |  | 1.00 | 1.00 |  |  |  |  |  |  |
2018 Convertible Senior Notes | ADS |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Initial conversion rate |  | 0.0127568 |  |  |  |  |  |  |  |  |  |
Initial conversion price (in dollars per share) | $ / shares |  | $ 78.39 |  |  |  |  |  |  |  |  |  |
Increased initial conversion price, after effect of call option and warrants (in dollars per share) | $ / shares |  |  |  | $ 96.27 |  |  |  |  |  |  |  |
2018 Convertible Senior Notes | ADS | Written call option | Long | Maximum |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Number of shares agreed to be sold by the counterparty on exercise of Purchased Call option | shares |  | 10.2 |  |  |  |  |  |  |  |  |  |
2018 Convertible Senior Notes | ADS | Sold Warrants |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of warrants |  | $ 77,200,000 |  |  |  |  |  |  |  |  |  |
Exercise price of warrants sold (in dollars per share) | $ / shares |  | $ 96.27 |  |  |  |  |  |  |  |  |  |
Expected life of warrants |  | 5 years |  |  |  |  |  |  |  |  |  |
2018 Convertible Senior Notes | ADS | Sold Warrants | Maximum |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Number of shares that can be purchased from warrants sold | shares |  | 10.2 |  |  |  |  |  |  |  |  |  |
Priceline Convertible Notes | Priceline Convertible Notes I | ADS |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |
Initial conversion price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 81.36

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