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Commitments (Details 2) - CNY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Operating lease commitments for office facility and transportation equipment      
No later than 1 year ¥ 400 ¥ 198  
Later than 1 year and no later than 5 years 623 214  
More than 5 years 33 8  
Total 1,056 420  
Rental expenses under operating leases ¥ 322 ¥ 217 ¥ 251