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Intangible assets (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2015 USD ($) | Mar. 31, 2015 CNY (¥) | Mar. 31, 2014 CNY (¥) | Mar. 31, 2013 CNY (¥) | Mar. 31, 2015 CNY (¥)
Intangible assets |  |  |  |  |
Less: accumulated amortization and impairment |  |  | ¥ (1,217,000,000) |  | ¥ (3,543,000,000)
Net book value | $ 1,061 |  | 1,906,000,000 |  | 6,575,000,000
Amortization of intangible assets | $ 337 | ¥ 2,089,000,000 | 315,000,000 | ¥ 130,000,000 |
Impairment charge |  | ¥ 0 | 0 | ¥ 18,000,000 |
Non-compete agreements |  |  |  |  |
Intangible assets |  |  |  |  |
Gross carrying amount |  |  | 1,050,000,000 |  | 3,630,000,000
Developed technology and patents |  |  |  |  |
Intangible assets |  |  |  |  |
Gross carrying amount |  |  | 1,041,000,000 |  | 3,331,000,000
Trade names, trademarks and domain names |  |  |  |  |
Intangible assets |  |  |  |  |
Gross carrying amount |  |  | 768,000,000 |  | 2,007,000,000
User base and customer relationships |  |  |  |  |
Intangible assets |  |  |  |  |
Gross carrying amount |  |  | ¥ 264,000,000 |  | 855,000,000
Copyrights and other |  |  |  |  |
Intangible assets |  |  |  |  |
Gross carrying amount |  |  |  |  | ¥ 295,000,000

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- Definition Accumulated amount of amortization of assets and the amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value, excluding financial assets and goodwill, lacking physical substance with a finite life. + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + 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)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + 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)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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