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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Statement of Comprehensive Income [Abstract]    
Net income $ 37,007 $ 21,941
Other comprehensive income (loss):    
Currency translation gain (loss), net of taxes 1,456 (296)
Defined benefit pension plans:    
Net gain (loss) and prior service costs, net of taxes (152) 310
Amortization included in operating expenses 50 433
Hedging gain (loss):    
Deferred hedging gain (loss), net of taxes (3,209) 965
Reclassification of hedging loss included in cost of goods sold 533 740
Other comprehensive income (loss): (1,322) 2,152
Total comprehensive income $ 35,685 $ 24,093