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Concentrations of Risk (Details) - manufacturer	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Concentration Risk [Line Items]
Number of third-party manufacturers	113
Sales | Product concentration risk | Top 5 brands
Concentration Risk [Line Items]
Concentration risk, percentage	42.90%	41.20%	40.00%
Sales | Customer concentration risk | Walmart
Concentration Risk [Line Items]
Concentration risk, percentage	23.70%	23.80%	21.10%
Sales | Supplier concentration risk
Concentration Risk [Line Items]
Concentration risk, percentage	65.60%	73.60%
Number of third-party manufacturers with long-term contracts	33	46
Accounts receivable | Customer concentration risk | Walmart
Concentration Risk [Line Items]
Concentration risk, percentage	25.10%

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Number of Third-party Manufacturers

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Number of Third-party Manufacturers with Long-term Contracts

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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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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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