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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Statement of Comprehensive Income [Abstract]      
Net income $ 257,573 $ 208,542 $ 205,876
Currency translation gain (loss):      
Currency translation gain (loss), net of taxes (7,790) 5,860 (5,670)
Reclassification of currency translation loss included in other income (expense), net (510) 0 0
Defined benefit plans:      
Net gain (loss) and prior service credits (costs), net of taxes (7,353) 3,955 14,201
Reclassification of amortization included in other income (expense), net (181) 127 1,490
Hedging gain (loss):      
Deferred hedging gain (loss), net of taxes 1,781    
Deferred hedging gain (loss), net of taxes   (8,499) 2,928
Reclassification of hedging loss (gain) included in cost of goods sold 1,810    
Reclassification of hedging loss (gain) included in cost of goods sold   (5,808) 1,670
Total other comprehensive income (loss) (12,243) 7,251 11,279
Total comprehensive income $ 245,330 $ 215,793 $ 217,155