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Related party transactions- Transactions with Yahoo (Details) - Yahoo ¥ in Millions, $ in Millions | 12 Months Ended | 21 Months Ended | 87 Months Ended
--- | --- | --- | ---
Mar. 31, 2015 USD ($) | Mar. 31, 2015 CNY (¥) | Sep. 30, 2014 | Dec. 31, 2012
TIPLA royalty fee |  |  |  |
Amount incurred or disbursed by the Company |  |  |  |
Fee |  | ¥ 448 |  |
Fee, as a percentage of revenues |  |  | 1.50% | 2.00%
Purchase of patents |  |  |  |
Amount incurred or disbursed by the Company |  |  |  |
Purchases | $ 24 | ¥ 144 |  |

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