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Related party transactions (Details) ¥ in Millions, $ in Millions | 1 Months Ended | 12 Months Ended | 27 Months Ended | 87 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2012 USD ($) | Sep. 30, 2012 CNY (¥) | Mar. 31, 2015 USD ($) | Mar. 31, 2015 CNY (¥) | Mar. 31, 2014 USD ($) | Mar. 31, 2014 CNY (¥) | Mar. 31, 2013 CNY (¥) | Mar. 31, 2015 | Dec. 31, 2012
Amount incurred or disbursed by the Company |  |  |  |  |  |  |  |  |
Payment |  |  |  |  |  |  | ¥ 3,487 |  |
Yahoo | TIPLA royalty fee |  |  |  |  |  |  |  |  |
Amount incurred or disbursed by the Company |  |  |  |  |  |  |  |  |
Fee |  |  |  | ¥ 448 |  | ¥ 748 | 592 |  |
Fee, as a percentage of revenues |  |  |  |  |  |  |  | 1.50% | 2.00%
Yahoo | Purchase of patents |  |  |  |  |  |  |  |  |
Amount incurred or disbursed by the Company |  |  |  |  |  |  |  |  |
Purchases |  |  | $ 24 | ¥ 144 | $ 70 | ¥ 430 |  |  |
Yahoo | TIPLA amendment payment |  |  |  |  |  |  |  |  |
Amount incurred or disbursed by the Company |  |  |  |  |  |  |  |  |
Payment | $ 550 | ¥ 3,487 |  |  |  |  | ¥ 3,487 |  |

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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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