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Commitments- Operating lease commitments (Details) - CNY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Operating lease commitments for office facility and transportation equipment      
No later than 1 year ¥ 2,760 ¥ 862  
Later than 1 year and no later than 5 years 7,652 1,593  
More than 5 years 11,940 834  
Total 22,352 3,289  
Rental expenses under operating leases ¥ 2,279 ¥ 747 ¥ 451