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Concentrations of Risk (Details) - manufacturer | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Concentration Risk [Line Items] |  |  |  |
Number of third-party manufacturers | 113 | 113 | 113 | 113
Sales | Customer Concentration Risk | Walmart |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk, percentage | 20.70% | 23.20% | 21.70% | 23.40%
Sales | Supplier Concentration Risk |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk, percentage |  |  | 68.90% | 66.20%
Number of third-party manufacturers with long-term contracts |  |  | 18 | 17
Top 5 brands | Sales | Product Concentration Risk |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk, percentage | 43.60% | 41.70% | 45.60% | 42.80%

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