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Intangible assets, net (Tables) | 12 Months Ended
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Mar. 31, 2017
Intangible assets, net |
Schedule of intangible assets, net |
|  | As of March 31, |
|  | 2016 |  | 2017 |
|  | (in millions of RMB) |
Non-compete agreements |  |  | 4,284 |  |  | 5,915 |
Developed technology and patents |  |  | 3,652 |  |  | 4,793 |
Trade names, trademarks and domain names |  |  | 2,222 |  |  | 8,100 |
User base and customer relationships |  |  | 1,234 |  |  | 4,169 |
Licensed copyrights of video content |  |  | 787 |  |  | 6,087 |
Others |  |  | — |  |  | 32 |
Less: accumulated amortization and impairment |  |  | (6,809 | ) |  | (14,988 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net book value |  |  | 5,370 |  |  | 14,108 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of estimated future aggregate amortization expenses |
|  | Amounts |
|  | (in millions of RMB) |
For the year ending March 31, |  |  |  |
2018 |  |  | 6,129 |
2019 |  |  | 2,880 |
2020 |  |  | 906 |
2021 |  |  | 429 |
2022 |  |  | 417 |
Thereafter |  |  | 3,347 |
​ | ​ | ​ | ​ | ​
|  |  | 14,108 |
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​

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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=66006027&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=66006027&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=66006027&loc=d3e16323-109275 + Details
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