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Share-based awards (Details 4)	12 Months Ended
	Mar. 31, 2015 CNY (¥)	Mar. 31, 2014 CNY (¥)	Mar. 31, 2013 CNY (¥)	Mar. 31, 2015 $ / shares shares	Sep. 30, 2014 shares	Mar. 31, 2014 $ / shares shares
Share-based awards
Number of shares underlying				619,922,272
Share-based compensation expense | ¥	¥ 13,028,000,000	¥ 2,844,000,000	¥ 1,259,000,000
Partner Capital Investment Plan | Subscription rights
Share-based awards
Agreed-upon exercise price | $ / shares				$ 14.50		$ 14.50
Subscription period	4 years	4 years
Restriction period for the transfer shares	8 years	8 years
Number of shares underlying				18,000,000		18,000,000
Share-based compensation expense | ¥	¥ 211,000,000	¥ 0
Subscription right fair value assumptions
Risk-free interest rate	1.50%	1.03%
Expected dividend yield	0.00%	0.00%
Expected life (years)	4 years	4 years
Expected volatility	38.10%	36.90%
Discount for post-vesting sale restrictions	35.00%	38.00%
Partner Capital Investment Plan | Subscription rights | Management member(s)
Share-based awards
Number of shares underlying						5,000,000
Partner Capital Investment Plan | Subscription rights | Management member(s) | Alibaba Partnership
Share-based awards
Number of shares underlying					1,500,000

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Period over which subscription rights at the subscription price can be exercised, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period over which underlying ordinary shares may not be transferred from the date of subscription of the relevant rights, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Restrictions on equity-based instruments during the vesting period, such as the inability to transfer unvested awards, are not taken into account in estimating the fair value of the award. However, restrictions that remain in effect after an award is vested, such as the inability to transfer or hedge vested options or a prohibition on the sale of outstanding vested shares (or other type of equity) for a period of time, affect the estimate of an award's fair value.

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Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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