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Commitments- Operating lease commitments (Details) - CNY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Operating lease commitments for office facility and transportation equipment      
No later than 1 year ¥ 862 ¥ 394  
Later than 1 year and no later than 5 years 1,593 441  
More than 5 years 834 65  
Total 3,289 900  
Rental expenses under operating leases ¥ 747 ¥ 451 ¥ 322