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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]        
Net income $ 80,773 $ 97,465 $ 174,138 $ 166,451
Other comprehensive income (loss):        
Currency translation gain (loss), net of taxes 1,535 (7,968) 5,176 (7,714)
Defined benefit pension plans:        
Net gain and prior service costs, net of taxes 479 1,193 859 1,520
Amortization included in operating expenses 51 424 153 1,289
Hedging gain (loss):        
Deferred hedging gain (loss), net of taxes (677) 2,497 (6,026) 4,026
Reclassification of hedging loss (gain) included in cost of goods sold 2,248 (463) 5,377 432
Other comprehensive income (loss): 3,636 (4,317) 5,539 (447)
Total comprehensive income $ 84,409 $ 93,148 $ 179,677 $ 166,004