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Risks and Concentration - Additional Information (Detail) - Customer | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2005 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Concentration Risk [Line Items] |  |  |  |
Appreciation (depreciation) of RMB against US$ |  | 7.30% | (5.20%) |
Maximum |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Appreciation (depreciation) of RMB against US$ | 20.00% |  |  |
Sales Revenue, Net | Customer Concentration Risk |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Number of customers with revenue greater than 10% of total revenue |  | 0 | 0 | 0
Cost of Goods, Total | Supplier Concentration Risk |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Number of suppliers with purchases greater than 10% of total purchases |  | 0 | 0 | 0

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- Definition Appreciation or Depreciation of Functional Currency of Entity and its Subsidiaries and VIEs Against Reporting Currency by Percentage + References No definition available. + Details
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