Derivatives Fair Value (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Mar. 31, 2017
Foreign Exchange Forward [Member]
Derivative Instrument Detail [Abstract]
Derivative Liability, Fair Value, Gross Liability	$ (3,900)		$ (3,900)		$ 2,907
Derivative Liability, Fair Value, Gross Asset	0		0		0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	(3,900)		(3,900)		2,907
Foreign Exchange Forward [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivative Instrument Detail [Abstract]
Derivative Asset, Fair Value, Gross Asset	0		0		2,907
Derivative Asset, Fair Value, Gross Liability	0		0		40
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	0		0		2,947
Foreign Exchange Forward [Member] | Accrued Liabilities [Member]
Derivative Instrument Detail [Abstract]
Derivative Liability, Fair Value, Gross Liability	(3,900)		(3,900)		0
Derivative Liability, Fair Value, Gross Asset	0		0		(40)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	(3,900)		(3,900)		(40)
Mexico, Pesos
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	69,000		69,000		$ 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	(1,800)	(980)	(2,904)	(3,873)
Operating Expense [Member]
Derivative Instrument Detail [Abstract]
Derivative, Gain (Loss) on Derivative, Net	(1,800)	(980)	(2,904)	(3,873)
Operating Income (Loss) [Member]
Derivative Instrument Detail [Abstract]
Derivative, Gain (Loss) on Derivative, Net	$ (1,800)	$ (980)	$ (2,904)	$ (3,873)