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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, 2020
shares
Share-based awards        
Number of shares authorized but unissued       265,848,704
Ratio of share subdivision 8      
ADS ratio 8 1    
Number of ordinary share issuable upon vesting of one outstanding RSU or exercise of one outstanding share option 8 1    
Share option and RSUs with four-year vesting schedule        
Share-based awards        
Vesting period       4 years
Vesting percentage       25.00%
Share option and RSUs with four-year vesting schedule | Maximum        
Share-based awards        
Expiry period       6 years
Share option and RSUs with four-year vesting schedule and initial vesting at first anniversary        
Share-based awards        
Vesting percentage       25.00%
Share option and RSUs with four-year vesting schedule and initial vesting at second anniversary        
Share-based awards        
Vesting percentage       50.00%
Share option and RSUs with six-year vesting schedule        
Share-based awards        
Vesting period       6 years
Share option and RSUs 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