Concentration Risk - Additional Information (Detail)	3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2020
Customer Concentration Risk | Net Revenues
Concentration Risk [Line Items]
Concentration risk, percentage	88.00%	88.00%	81.00%	80.00%
Customer Concentration Risk | Net Revenues | Walmart
Concentration Risk [Line Items]
Concentration risk, percentage	42.00%	45.00%	39.00%	44.00%
Customer Concentration Risk | Net Revenues | Amazon.com
Concentration Risk [Line Items]
Concentration risk, percentage	7.00%	30.00%	29.00%	24.00%
Customer Concentration Risk | Net Revenues | Fred Meyer
Concentration Risk [Line Items]
Concentration risk, percentage	39.00%	13.00%	13.00%	12.00%
Product Concentration Risk | Net Revenues | Microwave Ovens
Concentration Risk [Line Items]
Concentration risk, percentage	25.00%	28.00%	36.00%	36.00%
Product Concentration Risk | Net Revenues | Audio Products
Concentration Risk [Line Items]
Concentration risk, percentage	73.00%	64.00%	62.00%	59.00%
Credit Concentration Risk | Accounts Receivable | Customer One
Concentration Risk [Line Items]
Concentration risk, percentage			51.00%		45.00%
Credit Concentration Risk | Accounts Receivable | Customer Two
Concentration Risk [Line Items]
Concentration risk, percentage			36.00%		45.00%
Supplier Concentration Risk | Products for Resale
Concentration Risk [Line Items]
Concentration risk, percentage	57.00%	48.00%	58.00%	52.00%
Supplier Concentration Risk | Products for Resale | Two Largest Factory Suppliers
Concentration Risk [Line Items]
Concentration risk, percentage	95.00%	90.00%	98.00%	86.00%