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Concentrations of Risk (Narrative) (Details)
3 Months Ended
Jun. 30, 2017
manufacturer
customer
Jun. 30, 2016
manufacturer
Concentration Risk [Line Items]    
Number of third-party manufacturers 116 102
Sales | Product Concentration Risk | Top 5 Customers    
Concentration Risk [Line Items]    
Concentration risk, percentage 43.20% 42.30%
Sales | Customer Concentration Risk | Walmart and Walgreens    
Concentration Risk [Line Items]    
Number of customers exceeding concentration risk benchmark | customer 2  
Sales | Customer Concentration Risk | Walmart    
Concentration Risk [Line Items]    
Concentration risk, percentage 25.50% 20.70%
Sales | Customer Concentration Risk | Walgreens    
Concentration Risk [Line Items]    
Concentration risk, percentage 9.10% 10.30%
Sales | Supplier Concentration Risk    
Concentration Risk [Line Items]    
Concentration risk, percentage 77.20% 79.70%
Number of third-party manufacturers with long-term contracts 48 55
Accounts Receivable | Customer Concentration Risk | Walmart    
Concentration Risk [Line Items]    
Concentration risk, percentage 26.10%  
Accounts Receivable | Customer Concentration Risk | Walgreens    
Concentration Risk [Line Items]    
Concentration risk, percentage 7.90%