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Intangible assets (Tables) | 12 Months Ended
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Mar. 31, 2015
Intangible assets |
Schedule of intangible assets |
|  |  | As of March 31, |
|  |  | 2014 |  | 2015 |
|  |  | (in millions of RMB) |
| Non-compete agreements |  |  | 1,050 |  |  | 3,630 |
| Developed technology and patents |  |  | 1,041 |  |  | 3,331 |
| Trade names, trademarks and domain names |  |  | 768 |  |  | 2,007 |
| User base and customer relationships |  |  | 264 |  |  | 855 |
| Copyrights and others |  |  | — |  |  | 295 |
| Less: accumulated amortization and impairment |  |  | (1,217 | ) |  | (3,543 | )
​ | ​ | ​ | ​ | ​ | ​ | ​
| Net book value |  |  | 1,906 |  |  | 6,575 |
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of estimated future aggregate amortization expenses |
|  |  | Amounts |
|  |  | (in millions of RMB) |
| For the year ending March 31, |  |  |  |
| 2016 |  |  | 2,629 |
| 2017 |  |  | 2,333 |
| 2018 |  |  | 1,186 |
| 2019 |  |  | 342 |
| 2020 |  |  | 71 |
| Thereafter |  |  | 14 |
​ | ​ | ​ | ​ | ​
|  |  |  | 6,575 |
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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