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Summary of significant accounting policies- Basis of presentation (Details)
Jul. 30, 2019
USD ($)
$ / shares
shares
Jul. 29, 2019
Mar. 31, 2019
$ / shares
¥ / $
shares
Mar. 31, 2018
$ / shares
shares
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 1    
Convenience translation        
Convenience exchange rate (RMB to USD) | ¥ / $     6.7112  
ADS        
Basis of presentation        
New shares issued (in shares) 0