Concentration Risk - Additional Information (Detail)	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Mar. 31, 2020
Customer Concentration Risk | Net Revenues
Concentration Risk [Line Items]
Concentration risk, percentage	77.00%	78.00%	76.00%	75.00%
Customer Concentration Risk | Net Revenues | Walmart
Concentration Risk [Line Items]
Concentration risk, percentage	32.00%	49.00%	37.00%	44.00%
Customer Concentration Risk | Net Revenues | Amazon.com
Concentration Risk [Line Items]
Concentration risk, percentage	22.00%	17.00%	22.00%	20.00%
Customer Concentration Risk | Net Revenues | Fred Meyer
Concentration Risk [Line Items]
Concentration risk, percentage	23.00%	12.00%	17.00%	11.00%
Product Concentration Risk | Net Revenues | Microwave Ovens
Concentration Risk [Line Items]
Concentration risk, percentage	46.00%	34.00%	43.00%	42.00%
Product Concentration Risk | Net Revenues | Audio Products
Concentration Risk [Line Items]
Concentration risk, percentage	52.00%	62.00%	54.00%	55.00%
Credit Concentration Risk | Accounts Receivable | Customer One
Concentration Risk [Line Items]
Concentration risk, percentage			43.00%		45.00%
Credit Concentration Risk | Accounts Receivable | Customer Two
Concentration Risk [Line Items]
Concentration risk, percentage			28.00%		45.00%
Supplier Concentration Risk | Products for Resale
Concentration Risk [Line Items]
Concentration risk, percentage	53.00%	100.00%	58.00%	56.00%
Supplier Concentration Risk | Products for Resale | Two Largest Factory Suppliers
Concentration Risk [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%	82.00%