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Intangible assets | 12 Months Ended
--- | ---
Mar. 31, 2015
Intangible assets |
Intangible assets | 16. 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 |
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization expenses for the years ended March 31, 2013, 2014 and 2015 amounted to RMB130 million, RMB315 million and RMB2,089 million, respectively. During the same periods, impairment charges of RMB18 million, nil and nil were recognized in the consolidated income statements, respectively. The estimated aggregate amortization expenses for each of the five succeeding fiscal years and thereafter are as follows:
|  |  | 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 The entire disclosure for all or part of the information related to 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 1 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 + Details
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