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Concentrations of Risk (Narrative) (Details) - manufacturer | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Concentration Risk [Line Items] |  |  |  |
Number of third-party manufacturers | 110 | 110 | 110 | 110
Sales | Customer Concentration Risk | Walmart |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk, percentage (percent) | 23.60% | 25.30% | 24.10% | 25.40%
Sales | Customer Concentration Risk | Walgreens |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk, percentage (percent) | 10.00% | 8.70% | 9.30% | 8.90%
Sales | Supplier Concentration Risk |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk, percentage (percent) |  |  | 60.00% | 79.50%
Number of third-party manufacturers with long-term contracts |  |  | 34 | 45
Top 5 brands | Sales | Product Concentration Risk |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk, percentage (percent) | 44.70% | 40.80% | 43.50% | 42.00%

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