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Investments - Summary of Gain from Investment Disposal (Detail) ¥ in Thousands, $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 20, 2018 USD ($) | Nov. 20, 2018 CNY (¥) | Mar. 31, 2020 USD ($) | Mar. 31, 2020 CNY (¥) | Mar. 31, 2021 CNY (¥) | Mar. 31, 2018 CNY (¥)
Schedule of Investments [Line Items] |  |  |  |  |  |
Cash consideration collected |  |  | $ 951 | ¥ 6,566 |  |
Less: Carrying value of investment as at November 20, 2018 |  |  |  | (102,373) | ¥ (51,346) |
Huzan Inc. |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Cash consideration collected | $ 5,172 | ¥ 35,501 |  |  |  |
Less: Carrying value of investment as at November 20, 2018 |  | (13,658) |  | ¥ (10,996) | ¥ (1,686) | ¥ (14,021)
Add: Realized gain in other comprehensive income |  | 9,393 |  |  |  |
Gain from investment disposal |  | ¥ 31,236 |  |  |  |

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