Concentrations of Risk (Details)	3 Months Ended		9 Months Ended
	Dec. 31, 2015 manufacturer	Dec. 31, 2014 manufacturer	Dec. 31, 2015 brand manufacturer customer	Dec. 31, 2014 brand manufacturer
Concentration Risk [Line Items]
Number of third-party manufacturers	101	96	101	96
Sales | Product Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	41.00%	44.30%	42.20%	41.90%
Number of highest selling brands comprising group against which concentration risk is measured | brand			5	5
Sales | Customer Concentration Risk | Walmart
Concentration Risk [Line Items]
Concentration risk, percentage	20.20%	16.50%	19.90%	17.40%
Number of customers exceeding concentration risk benchmark | customer			1
Sales | Customer Concentration Risk | Customer No. 2
Concentration Risk [Line Items]
Concentration risk, percentage	9.50%		9.60%
Sales | Supplier Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage			79.80%	80.10%
Number of third-party manufacturers with long-term contracts			47	44
Accounts Receivable | Customer Concentration Risk | Walmart
Concentration Risk [Line Items]
Concentration risk, percentage			20.90%