Supplemental Balance Sheets and Statements of Operations Detail (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Accounts receivable:
Trade	$ 115,504	$ 123,607
Allowance for doubtful accounts reserve	(925)	(1,401)
Ship-from-stock and debit reserve	(19,360)	(18,041)
Returns reserves	(3,190)	(2,993)
Rebates reserves	(780)	(1,035)
Price protection reserves	(270)	(125)
Accounts Receivable Deferred Sales	(122)	(1,065)
Accounts receivable	90,857	98,947
Inventories:
Raw materials and supplies	83,372	90,968
Work in process	52,759	61,310
Finished goods	53,211	62,522
Inventories, gross	189,342	214,800
Inventory reserves	(17,499)	(26,826)
Inventories, net	171,843	187,974
Allowance for commitments related to accounts receivables
Changes in allowance for accounts receivable and inventory reserve
Balance at the beginning of the period	24,660	18,518	17,463
Charged to operations	91,091	89,909	82,738
Write-offs	(90,909)	(83,911)	(81,621)
Other	(195)	144	(62)
Balance at the end of the period	24,647	24,660	18,518
Inventory reserves
Changes in allowance for accounts receivable and inventory reserve
Balance at the beginning of the period	26,826	18,464	17,144
Costs charged to expense	9,291	11,846	5,493
Write-offs	(17,520)	(3,880)	(3,836)
Other	(1,098)	396	(337)
Balance at the end of the period	$ 17,499	$ 26,826	$ 18,464