SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands		12 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Movement in Valuation Allowances and Reserves [Roll Forward]
Expected merchandise returns			$ 4,600	$ 4,000	$ 3,800
Allowance for Sales Returns [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	[1]	$ 752	653	613
Charged to Costs and Expenses	[1]	2,579	1,530	1,500
Deductions/Write-Offs	[1]	(2,432)	(1,431)	(1,460)
Balance at End of Period	[1]	899	752	653	613
Reserve for Credit Losses [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		5,392	5,193	5,623
Charged to Costs and Expenses		462	277	(242)
Deductions/Write-Offs		(3,190)	(78)	(188)
Balance at End of Period		2,664	5,392	5,193	5,623
Valuation for Deferred Taxes [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		1,270	1,270	1,223
Charged to Costs and Expenses		67	0	47
Deductions/Write-Offs		0	0	0
Balance at End of Period		$ 1,337	$ 1,270	$ 1,270	$ 1,223

[1] These amounts represent the gross profit effect of sales returns during the respective years. Expected merchandise returns after year-end for sales made before year-end were $4.6 million, $4.0 million, and $3.8 million as of March 31, 2017, 2016, and 2015, respectively.