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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%