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Earnings per share (Details) ¥ / shares in Units, $ / shares in Units, ¥ in Millions, shares in Millions, $ in Millions | 12 Months Ended
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Mar. 31, 2015 USD ($) $ / shares shares | Mar. 31, 2015 CNY (¥) ¥ / shares shares | Mar. 31, 2014 CNY (¥) ¥ / shares shares | Mar. 31, 2013 CNY (¥) ¥ / shares shares
Numerator: |  |  |  |
Net income attributable to ordinary shareholders for computing net income per ordinary share - basic | $ 3,896 | ¥ 24,149 | ¥ 23,076 | ¥ 8,404
Reversal of accretion of Convertible Preference Shares | ¥ |  | 15 | 31 | 17
Reversal of dividend of Convertible Preference Shares | ¥ |  | 97 | 208 | 111
Net income attributable to ordinary shareholders for computing net income per ordinary share - diluted | ¥ |  | ¥ 24,261 | ¥ 23,315 | ¥ 8,532
Shares (denominator): |  |  |  |
Weighted average number of shares used in calculating net income per ordinary share - basic (million shares) | 2,337 | 2,337 | 2,175 | 2,294
Adjustments for dilutive share options and RSUs (million shares) | 120 | 120 | 66 | 46
Conversion of Convertible Preference Shares (million shares) | 43 | 43 | 91 | 49
Weighted average number of shares used in calculating net income per ordinary share - diluted (million shares) | 2,500 | 2,500 | 2,332 | 2,389
Net income per ordinary share/ADS - basic | (per share) | $ 1.67 | ¥ 10.33 | ¥ 10.61 | ¥ 3.66
Net income per ordinary share/ADS - diluted | (per share) | $ 1.56 | ¥ 9.70 | ¥ 10.00 | ¥ 3.57

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- Definition The after-tax amount of any dividends on convertible preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256 + Details
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