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Property and equipment, net (Details) ¥ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2015 CNY (¥) | Mar. 31, 2014 CNY (¥) | Mar. 31, 2013 CNY (¥) | Mar. 31, 2015 USD ($) | Mar. 31, 2015 CNY (¥)
Property and Equipment, Net |  |  |  |  |
Gross |  | ¥ 9,161 |  |  | ¥ 14,905
Less: accumulated depreciation and amortization |  | (3,580) |  |  | (5,766)
Net book value |  | 5,581 |  | $ 1,474 | 9,139
Depreciation and Amortization |  |  |  |  |
Depreciation and amortization expenses | ¥ 2,282 | 1,295 | ¥ 764 |  |
Computer equipment and software |  |  |  |  |
Property and Equipment, Net |  |  |  |  |
Gross |  | 5,675 |  |  | 9,829
Buildings and leasehold improvements |  |  |  |  |
Property and Equipment, Net |  |  |  |  |
Gross |  | 2,434 |  |  | 2,828
Construction in progress |  |  |  |  |
Property and Equipment, Net |  |  |  |  |
Gross |  | 780 |  |  | 1,818
Furniture, office and transportation equipment |  |  |  |  |
Property and Equipment, Net |  |  |  |  |
Gross |  | ¥ 272 |  |  | ¥ 430

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 14 -Article 5 + Details
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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: 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 + Details
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