Amount appropriated to the enterprise expansion fund and staff welfare and bonus fund for entities incorporated in PRC.

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Amount appropriated from retained earnings to statutory reserves for entities incorporated in PRC.

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Represents the minimum percentage of net income from subsidiaries required to be appropriated towards the statutory reserve fund for entities incorporated in the People's Republic of China until the reserve balance reaches 50 percent of registered capital.

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Percentage derived by dividing the results of the hedging instrument by the results of the hedged item, determining effective hedging relationship.

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Represents the level of the statutory reserve fund balance as a percentage of registered capital for entities incorporated in the People's Republic of China which must be attained before mandatory transfers to the reserve are no longer required.

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Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

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Amount of gain (loss) included in earnings for the period from the increase (decrease) in fair value of interest rate derivatives not designated as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5618551-113959

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-Section 50
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-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959

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The amount of net gains or losses on interest rate cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Fair value of all derivative liabilities designated as hedges of net investment in foreign operations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
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Number of shares held for each class of treasury stock.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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Summary of significant accounting policies- Others (Details) $ in Millions	12 Months Ended
	Mar. 31, 2016 USD ($) shares	Mar. 31, 2016 CNY (¥)	Mar. 31, 2015 CNY (¥) shares	Mar. 31, 2014 CNY (¥)	Mar. 31, 2016 CNY (¥) shares
Statutory reserves
Percentage of after-tax profit from subsidiaries incorporated in the PRC required to be appropriated to the statutory reserves	10.00%	10.00%
Limit of statutory reserve fund as a percentage of registered capital, after which allocations to statutory reserve fund are no longer required	50.00%	50.00%
PRC
Statutory reserves
Appropriation to statutory reserves		¥ 529,000,000	¥ 267,000,000	¥ 1,137,000,000
Appropriation to the enterprise expansion fund and staff welfare and bonus fund		¥ 0	¥ 0	0
Share repurchase for purpose of certain equity investment plans for management
Treasury shares
Number of ordinary shares included in treasury shares account \| shares	24,393,569		28,245,662		24,393,569
Minimum
Derivatives and hedging
Ratio determining effective hedging relationship	80.00%	80.00%
Maximum
Derivatives and hedging
Ratio determining effective hedging relationship	125.00%	125.00%
Interest rate swaps
Derivatives and hedging
Gain (loss) on the fair value change of the interest rate swaps not qualified for hedge accounting			¥ (43,000,000)	¥ 102,000,000
Loss recorded in consolidated income statements upon termination of the interest rate swap contracts			¥ 59,000,000
Foreign exchange contracts
Derivatives and hedging
Fair value amount of qualified and designated as hedging instruments	$ 40				¥ 257,000,000
Loss recognized in other income, net	$ 46	¥ 298,000,000