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Concentrations of Risk (Details) - manufacturer | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Concentration Risk [Line Items] |  |  |  |
Number of third-party manufacturers | 113 | 110 | 113 | 110
Sales | Customer Concentration Risk | Walmart |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk, percentage (percent) | 22.90% | 23.60% | 23.50% | 24.10%
Sales | Supplier Concentration Risk |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk, percentage (percent) |  |  | 66.40% | 60.00%
Number of third-party manufacturers with long-term contracts |  |  | 30 | 34
Top 5 brands | Sales | Product Concentration Risk |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk, percentage (percent) | 42.60% | 44.70% | 43.30% | 43.50%

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