Concentrations of Risk (Details) - manufacturer	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 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	22.50%	22.90%	22.30%	23.50%
Sales | Supplier Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage			65.40%	66.40%
Number of third-party manufacturers with long-term contracts			19	30
Top 5 brands | Sales | Product Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	45.80%	42.60%	46.20%	43.30%