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Share-based awards- General (Details)
12 Months Ended
Jul. 30, 2019
shares
Jul. 29, 2019
shares
Apr. 01, 2015
shares
Mar. 31, 2021
shares
Mar. 31, 2020
Share-based awards          
Number of shares authorized but unissued       276,575,864  
Ratio of share subdivision 8        
ADS ratio 8 1   8 8
Number of ordinary share issuable upon vesting of one outstanding RSU or exercise of one outstanding share option 8 1      
Share-based awards with four-year vesting schedule          
Share-based awards          
Vesting period       4 years  
Vesting percentage       25.00%  
Share-based awards with four-year vesting schedule and initial vesting at first anniversary          
Share-based awards          
Vesting percentage       25.00%  
Share-based awards with four-year vesting schedule and initial vesting at second anniversary          
Share-based awards          
Vesting percentage       50.00%  
Share-based awards with six-year vesting schedule          
Share-based awards          
Vesting period       6 years  
Share-based awards with six-year vesting schedule | Maximum          
Share-based awards          
Expiry period       10 years  
2014 Plan          
Share-based awards          
Plan term       10 years  
2014 Plan | Maximum          
Share-based awards          
Additional number of shares subject to award     200,000,000    
2014 Plan | Maximum | Before the Share Subdivision          
Share-based awards          
Additional number of shares subject to award     25,000,000