CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 7,437	$ 19,676
Other comprehensive income (loss):
Currency translation gain, net of taxes	2,618	201
Defined benefit pension plans:
Net gain (loss) and prior service costs, net of taxes	(1,130)	139
Amortization included in operating expenses	416	113
Hedging gain (loss):
Deferred hedging gain (loss), net of taxes	(2,262)	248
Reclassification of hedging loss (gain) included in cost of goods sold	(2,460)	400
Other comprehensive income (loss):	(2,818)	1,101
Total comprehensive income	$ 4,619	$ 20,777