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Summary of significant accounting policies - Basis of presentation (Details)
Jul. 30, 2019
USD ($)
$ / shares
shares
Mar. 31, 2022
$ / shares
$ / ¥
shares
Mar. 31, 2021
$ / shares
shares
Mar. 31, 2020
Jul. 29, 2019
Basis of presentation          
Ratio of share subdivision 8        
Authorized share capital | $ $ 100,000        
Ordinary shares authorized (in shares) 32,000,000,000 32,000,000,000 32,000,000,000    
Ordinary shares par value (in USD per share) | $ / shares $ 0.000003125 $ 0.000003125 $ 0.000003125    
ADS ratio 8 8 8 8 1
Convenience translation          
Convenience exchange rate (RMB to USD) | $ / ¥   6.3393      
American Depositary Shares ("ADSs")          
Basis of presentation          
Shares issued (in shares) 0