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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Statement of Comprehensive Income [Abstract]      
Net income $ 208,542 $ 205,876 $ 119,317
Currency translation gain (loss):      
Currency translation gain (loss), net of taxes 5,860 (5,670) 2,273
Reclassification of currency translation loss included in other income (expense), net 0 0 3,913
Defined benefit plans:      
Net gain (loss) and prior service credits (costs), net of taxes 3,955 14,201 (837)
Reclassification of amortization included in operating expenses 127 1,490 1,630
Hedging gain (loss):      
Deferred hedging gain (loss), net of taxes (8,499) 2,928 (2,431)
Reclassification of hedging loss (gain) included in cost of goods sold 5,808 (1,670) (3,296)
Total other comprehensive income 7,251 11,279 1,252
Total comprehensive income $ 215,793 $ 217,155 $ 120,569