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Risks and contingencies (Details) - CNY (¥)
1 Months Ended 12 Months Ended
Apr. 30, 2021
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Risks and contingencies        
Anti-monopoly fine     ¥ 18,228,000,000  
Number of consecutive years the Company is required to file a self-assessment and compliance report to the SAMR 3 years      
Collectability of payments made relating to trade assurance program        
Risks and contingencies        
Provisions made in relation to the program   ¥ 0 ¥ 0 ¥ 0