Accounts Receivable - Net (Details) - USD ($)	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Mar. 31, 2015
Accounts Receivable - Net [Abstract]
Accounts receivable - trade	$ 54,526,000		$ 62,171,000
Allowance for bad debts	(534,000)		(629,000)
Customer allowances earned	(7,577,000)		(7,221,000)
Customer payment discrepancies	(818,000)		(852,000)
Customer returns RGA issued	(7,349,000)		(7,029,000)
Customer core returns accruals	(27,619,000)		(21,641,000)
Less: total accounts receivable offset accounts	(43,897,000)		(37,372,000)
Total accounts receivable - net	10,629,000		24,799,000
Warranty Returns [Abstract]
Warranty accrual included in customer returns RGA issued	3,040,000		3,746,000
Warranty accrual included in customer finished goods returns accrual	6,745,000		$ 7,158,000
Change in warranty return accrual [Roll Forward]
Balance at beginning of period	10,904,000	$ 8,039,000
Charged to expense/additions	17,371,000	13,007,000
Amounts processed	(18,490,000)	(13,998,000)
Balance at end of period	$ 9,785,000	$ 7,048,000