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Accounts Receivable - Net (Details) (USD $)
 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Accounts Receivable - Net [Abstract]    
Accounts receivable - trade $ 76,700,000 [1] $ 83,937,000 [1]
Allowance for bad debts (1,590,000) (968,000)
Customer allowances earned (22,878,000) [1] (25,322,000) [1]
Customer payment discrepancies (2,550,000) (280,000)
Customer fill rate penalties (6,776,000) [1] (7,827,000) [1]
Customer returns RGA issued (7,373,000) (5,875,000)
Customer core returns accruals (21,222,000) (23,629,000)
Less: total accounts receivable offset accounts (62,389,000) (63,901,000)
Total accounts receivable - net 14,311,000 20,036,000
Amount reclassified from accounts receivable trade to customer allowances earned   9,072,000
Amount reclassified from accounts receivable trade to customer fill rate penalties   7,827,000
Warranty Returns [Abstract]    
Warranty accrual included in customer returns RGA issued 4,214,000  
Warranty accrual included in customer finished goods returns accrual 7,344,000  
Change in warranty return accrual [Roll Forward]    
Balance at beginning of period 9,023,000 8,969,000
Charged to expense 63,315,000 [2] 67,048,000 [2]
Amounts processed (60,780,000) [2] (66,994,000) [2]
Balance at end of period $ 11,558,000 $ 9,023,000
[1] Amounts shown above as customer allowances earned and customer fill rate penalties include $9,072,000 and $7,827,000, respectively, at March 31, 2012 which have been reclassified from accounts receivable – trade to conform to the fiscal 2013 presentation.
[2] Amounts shown above as warranty claims processed and charged to expense for the year ended March 31, 2012 have been reclassified to conform to the current year presentation.