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Share-based awards (Details 2)
¥ in Millions
 12 Months Ended
Mar. 31, 2015
$ / shares
Mar. 31, 2015
CNY (¥)
shares
Mar. 31, 2014
$ / shares
Mar. 31, 2014
CNY (¥)
shares
Mar. 31, 2013
$ / shares
Mar. 31, 2013
CNY (¥)
Mar. 31, 2015
CNY (¥)
shares
Additional disclosure              
Share-based compensation expense   ¥ 13,028   ¥ 2,844   ¥ 1,259  
Options              
Number of share options              
Outstanding at beginning of year | shares   13,345,902          
Granted | shares   13,788,000          
Exercised | shares   (5,365,112)          
Cancelled/forfeited/expired | shares   (429,380)          
Outstanding at end of year | shares   21,339,410   13,345,902      
Vested and exercisable | shares             1,293,743
Vested and expected to vest | shares             20,865,685
Weighted average exercise price              
Outstanding at beginning of year | $ / shares $ 13.86            
Granted | $ / shares 56.64            
Exercised | $ / shares 10.34            
Cancelled/forfeited/expired | $ / shares 18.47            
Outstanding at end of year | $ / shares 42.29   $ 13.86        
Vested and exercisable | $ / shares 8.76            
Vested and expected to vest | $ / shares 42.68            
Weighted average remaining contractual life              
Weighted average remaining contractual life, outstanding   6 years   4 years 1 month 6 days      
Weighted average remaining contractual life, vested and exercisable   2 years 6 months          
Weighted average remaining contractual life, vested and expected to vest   6 years 1 month 6 days          
Additional disclosure              
Unvested options early exercised | shares             4,663,833
Aggregate intrinsic value of all outstanding options             ¥ 5,386
Aggregate intrinsic value of options that were vested and exercisable             592
Aggregate intrinsic value of options that were vested and expected to vest             5,199
Weighted average grant date fair value of share options | $ / shares $ 23.07   $ 6.14   $ 5.20    
Total grant date fair value of options vested   ¥ 134   ¥ 123   219  
Aggregate intrinsic value of share options exercised   488   1,698   1,034  
Cash received from option exercises under the share option plans   313   1,543   362  
Share-based compensation expense   ¥ 1,152   ¥ 417   ¥ 227  
Fair value assumptions              
Risk-free interest rate, minimum   1.38%   0.69%   0.67%  
Risk-free interest rate, maximum   1.99%   1.52%   0.70%  
Expected dividend yield   0.00%   0.00%   0.00%  
Expected life (years)           4 years 4 months 17 days  
Expected volatility, minimum   35.04%   37.00%   41.70%  
Expected volatility, maximum   40.76%   39.30%   44.90%  
Unamortized compensation costs             ¥ 1,401
Expected period over which unamortized compensation costs is to be recognized   3 years          
Minimum | Options              
Fair value assumptions              
Expected life (years)   4 years 3 months   4 years 3 months      
Maximum | Options              
Fair value assumptions              
Expected life (years)   5 years 9 months   4 years 4 months 17 days      
Non-employees | Options              
Number of share options              
Outstanding at end of year | shares   605,340