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Share-based awards (Details 3)
¥ in Millions
12 Months Ended
Mar. 31, 2015
$ / shares
Mar. 31, 2015
CNY (¥)
shares
Mar. 31, 2014
CNY (¥)
shares
Mar. 31, 2013
CNY (¥)
Mar. 31, 2015
CNY (¥)
shares
Weighted-average grant-date fair value          
Share-based compensation expense | ¥   ¥ 13,028 ¥ 2,844 ¥ 1,259  
Restricted shares and RSUs          
Summary of changes in the restricted shares and RSUs          
Awarded and unvested at beginning of year   42,767,087      
Granted   42,787,283      
Vested   (13,159,265)      
Cancelled/forfeited   (4,413,935)      
Awarded and unvested at end of year   67,981,170 42,767,087    
Expected to vest         58,397,443
Weighted-average grant-date fair value          
Awarded and unvested at beginning of year | $ / shares $ 17.87        
Granted | $ / shares 62.53        
Vested | $ / shares 14.47        
Cancelled/forfeited | $ / shares 32.56        
Awarded and unvested at end of year | $ / shares 45.68        
Expected to vest | $ / shares $ 45.63        
Unamortized compensation costs | ¥         ¥ 11,114
Expected period over which unamortized compensation costs is to be recognized   2 years 2 months 12 days      
Share-based compensation expense | ¥   ¥ 7,767 ¥ 2,378 ¥ 845  
RSUs | Non-employees          
Summary of changes in the restricted shares and RSUs          
Awarded and unvested at end of year   6,447,715