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Summary of significant accounting policies (Details)	Jul. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2020 $ / shares $ / ¥ shares	Mar. 31, 2020 $ / shares shares	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			1
Convenience exchange rate (RMB to USD) | $ / ¥		6.7896
ADS
Basis of presentation
Shares issued (in shares)	0

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