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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 |  |  |  |

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