Accounts Receivable - Net (Details) (USD $)	3 Months Ended				9 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2012		Dec. 31, 2011		Mar. 31, 2012
Accounts Receivable - Net [Abstract]
Accounts receivable - trade	$ 74,003,000				$ 74,003,000				$ 83,937,000	[1]
Allowance for bad debts	(1,350,000)				(1,350,000)				(968,000)
Customer allowances earned	(21,723,000)				(21,723,000)				(25,322,000)	[1]
Customer payment discrepancies	(1,850,000)				(1,850,000)				(280,000)
Customer fill rate penalties	(7,938,000)				(7,938,000)				(7,827,000)	[1]
Customer returns RGA issued	(9,507,000)				(9,507,000)				(5,875,000)
Customer core returns accruals	(26,464,000)				(26,464,000)				(23,629,000)
Less: total accounts receivable offset accounts	(68,832,000)				(68,832,000)				(63,901,000)
Total accounts receivable - net	5,171,000				5,171,000				20,036,000
Amount reclassified from from accounts receivable trade to customer allowances earned									9,072,000
Warranty Returns [Abstract]
Warranty accrual included in customer returns RGA issued	4,795,000				4,795,000
Warranty accrual included in customer finished goods returns accrual	7,969,000				7,969,000
Change in warranty return accrual [Roll Forward]
Balance at beginning of period	10,258,000		7,324,000		9,023,000		8,969,000
Charged to expense	16,860,000	[2]	15,421,000	[2]	52,438,000	[2]	46,047,000	[2]
Amounts processed	(14,354,000)	[2]	(15,180,000)	[2]	(48,697,000)	[2]	(47,451,000)	[2]
Balance at end of period	$ 12,764,000		$ 7,565,000		$ 12,764,000		$ 7,565,000

[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 three and nine months ended December 31, 2011 have been reclassified to conform to the current year presentation.