Derivatives Hedging Foreign Currencies (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Foreign Exchange Forward
Derivatives, Fair Value [Line Items]
Derivative asset, as presented		$ (2,907)
Derivative liability, as presented	$ 1,154
Derivative liability, offset	0
Derivative asset, offset		0
Derivative asset, gross		2,907
Derivative liability, gross	1,154
Foreign Exchange Forward | Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative asset, as presented	(1,154)	(2,907)
Derivative asset, offset	0	40
Derivative asset, gross	1,154	2,947
Foreign Exchange Forward | Accrued Expenses
Derivatives, Fair Value [Line Items]
Derivative liability, as presented	0	0
Derivative liability, offset	0	(40)
Derivative liability, gross	0	(40)
Mexico, Pesos
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	70,600	49,100
Sales Revenue, Net [Member]
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	0	$ (789)
Cost of sales
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	2,420	5,170	3,199
Operating Expense [Member]
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	2,420	5,170	3,199
Operating Income (Loss) [Member]
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ (2,420)	$ (5,170)	$ (3,988)