Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Accounts receivable allowances [Member]
Valuation and Qualifying Accounts
Balance at Beginning of Period	$ 2,009	$ 1,764	$ 2,680
Additions Charged to Costs and Expenses	2,862	4,746	4,884
Additions Charged to Other Accounts	0	0	0
Deductions	3,202	4,501	5,800
Balance At End of Period	1,669	2,009	1,764
Accrued customer programs [Member]
Valuation and Qualifying Accounts
Balance at Beginning of Period	4,015	3,298	4,162
Additions Charged to Costs and Expenses	9,424	11,667	11,233
Additions Charged to Other Accounts	0	0	0
Deductions	8,619	10,950	12,097
Balance At End of Period	4,820	4,015	3,298
Accrued restructuring expenses [Member]
Valuation and Qualifying Accounts
Balance at Beginning of Period	1,900	590	0
Additions Charged to Costs and Expenses	0	3,998	724
Additions Charged to Other Accounts	0	0	0
Deductions	1,676	2,688	134
Balance At End of Period	$ 224	$ 1,900	$ 590