Derivatives Fair Value (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2017
Foreign Exchange Forward [Member]
Derivative Instrument Detail [Abstract]
Derivative Liability, Fair Value, Gross Liability	$ 1,430		$ 1,430		$ 2,907
Derivative Liability, Fair Value, Gross Asset	0		0		0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	1,430		1,430		2,907
Foreign Exchange Forward [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivative Instrument Detail [Abstract]
Derivative Asset, Fair Value, Gross Asset	1,430		1,430		2,907
Derivative Asset, Fair Value, Gross Liability	0		0		40
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	1,430		1,430		2,947
Foreign Exchange Forward [Member] | Accrued Liabilities [Member]
Derivative Instrument Detail [Abstract]
Derivative Liability, Fair Value, Gross Liability	0		0		0
Derivative Liability, Fair Value, Gross Asset	0		0		(40)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	0		0		(40)
Mexico, Pesos
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	64,800		64,800		$ 49,100
Sales [Member]
Derivative Instrument Detail [Abstract]
Derivative, Gain (Loss) on Derivative, Net	0	$ 0	0	$ 0
Cost of sales
Derivative Instrument Detail [Abstract]
Derivative, Gain (Loss) on Derivative, Net	1,104	(1,140)	45	(2,893)
Operating Expense [Member]
Derivative Instrument Detail [Abstract]
Derivative, Gain (Loss) on Derivative, Net	1,104	(1,140)	45	(2,893)
Operating Income (Loss) [Member]
Derivative Instrument Detail [Abstract]
Derivative, Gain (Loss) on Derivative, Net	$ 1,104	$ (1,140)	$ 45	$ (2,893)