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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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