Schedule II Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Accounts receivable allowances
Valuation and Qualifying Accounts
Balance at Beginning of Period	$ 1,363	$ 1,059	$ 1,669
Additions Charged to Costs and Expenses	5,188	2,712	2,143
Charged to Other Accounts	0	0	0
Deductions	5,268	2,408	2,753
Balance At End of Period	1,283	1,363	1,059
Accrued customer programs
Valuation and Qualifying Accounts
Balance at Beginning of Period	3,275	4,042	4,820
Additions Charged to Costs and Expenses	9,716	6,423	9,030
Charged to Other Accounts	2,296	0	0
Deductions	10,257	7,190	9,808
Balance At End of Period	5,030	3,275	4,042
Accrued restructuring expenses
Valuation and Qualifying Accounts
Balance at Beginning of Period	$ 0	32	224
Additions Charged to Costs and Expenses		0	0
Charged to Other Accounts		0	0
Deductions		32	192
Balance At End of Period		$ 0	$ 32