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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%