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Share-based compensation - Stock option activity (Details) - CNY (¥)
 12 Months Ended
Apr. 30, 2019
Oct. 31, 2018
May 09, 2018
Apr. 30, 2018
Oct. 11, 2017
May 03, 2016
Jun. 29, 2015
Jan. 25, 2015
Dec. 31, 2019
Dec. 31, 2018
Number of Options                    
Outstanding at beginning of the year (in shares)                 77,466,699  
Granted (in shares) 155,000 475,000 40,000,000 841,054 16,616,000 7,425,000 630,000 13,843,645 155,000  
Exercised (in shares)                 14,007,474  
Forfeited/Cancelled (in shares)                 3,452,998  
Outstanding at end of the year (in shares)                 60,161,227 77,466,699
Vested and expected to vest, Number of Options (in shares)                 60,161,227  
Exercisable, Number of Options (in shares)                 9,959,062  
Exercise Price                    
Granted (in dollars per share)     ¥ 4.75              
Outstanding at end of the year (in dollars per share) ¥ 31.96 ¥ 27.93 ¥ 30.27 ¥ 25.42     ¥ 0.27 ¥ 0.27    
Intrinsic value of options                    
Outstanding at beginning of the year                 ¥ 457,386,371  
Outstanding at end of the year                 74,834,115 ¥ 457,386,371
Vested and expected to vest, Intrinsic value of options                 74,834,115  
Exercisable, Intrinsic value of options                 ¥ 30,925,254  
Minimum                    
Exercise Price                    
Outstanding at beginning of the year (in dollars per share)                 ¥ 0.27  
Exercised (in dollars per share)                 0.27  
Forfeited/Cancelled (in dollars per share)                 0.27  
Outstanding at end of the year (in dollars per share)         ¥ 0.27 ¥ 0.27     0.27 ¥ 0.27
Vested and expected to vest, Exercise Price (in dollars per share)                 0.27  
Exercisable, Exercise Price (in dollars per share)                 ¥ 0.27  
Remaining Contractual                    
Outstanding remaining contractual term(in years)                 5 years 26 days 6 years 26 days
Exercised (in years)                 5 years 26 days  
Forfeited/Cancelled (in years)                 5 years 5 months 27 days  
Vested and expected to vest, Remaining Contractual (in years)                 5 years 26 days  
Exercisable, Remaining Contractual (in years)                 5 years 26 days  
Maximum                    
Exercise Price                    
Outstanding at beginning of the year (in dollars per share)                 ¥ 30.27  
Granted (in dollars per share)                 31.96  
Exercised (in dollars per share)                 10.71  
Forfeited/Cancelled (in dollars per share)                 31.96  
Outstanding at end of the year (in dollars per share)         ¥ 27.02 ¥ 10.71     31.96 ¥ 30.27
Vested and expected to vest, Exercise Price (in dollars per share)                 31.96  
Exercisable, Exercise Price (in dollars per share)                 ¥ 25.42  
Remaining Contractual                    
Outstanding remaining contractual term(in years)                 9 years 3 months 29 days 9 years 9 months 29 days
Granted (in years)                 9 years 3 months 29 days  
Exercised (in years)                 7 years 9 months 11 days  
Forfeited/Cancelled (in years)                 9 years 3 months 29 days  
Vested and expected to vest, Remaining Contractual (in years)                 9 years 3 months 29 days  
Exercisable, Remaining Contractual (in years)                 9 years 11 months 5 days