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Accounts Receivable - Net (Details) (USD $)
 3 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Mar. 31, 2014
Accounts Receivable - Net [Abstract]      
Accounts receivable - trade $ 44,341,000   $ 58,766,000
Allowance for bad debts (841,000)   (854,000)
Customer allowances earned (7,554,000)   (9,088,000)
Customer payment discrepancies (415,000)   (577,000)
Customer returns RGA issued (5,134,000)   (5,809,000)
Customer core returns accruals (22,442,000)   (20,155,000)
Less: total accounts receivable offset accounts (36,386,000)   (36,483,000)
Total accounts receivable - net 7,955,000   22,283,000
Warranty Returns [Abstract]      
Warranty accrual included in customer returns RGA issued 2,433,000   2,407,000
Warranty accrual included in customer finished goods returns accrual 4,615,000   5,632,000
Change in warranty return accrual [Roll Forward]      
Balance at beginning of period 8,039,000 6,205,000  
Charged to expense 13,007,000 11,368,000  
Amounts processed (13,998,000) (12,271,000)  
Balance at end of period $ 7,048,000 $ 5,302,000