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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

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- Definition

Number of customers that accounted for more than ten percent of revenue.

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- Definition

Number Of Suppliers That Accounted For More Than Ten Percent Of Total Purchases

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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