CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 612,143	$ 364,575	$ 644,513
Currency translation gain (loss):
Currency translation gain (loss), net of taxes	(3,078)	1,373	(14,051)
Reclassification of cumulative translation adjustments included in other income (expense), net	0	219	1,051
Defined benefit plans:
Net gain (loss) and prior service costs, net of taxes	(13,163)	16,089	22,328
Reclassification of amortization included in other income (expense), net	243	(8,069)	(2,623)
Hedging gain (loss):
Deferred hedging gain, net of taxes	1,109	2,625	6,308
Reclassification of hedging loss (gain) included in cost of goods sold	3,964	(8,391)	(8,221)
Total other comprehensive income (loss)	(10,925)	3,846	4,792
Total comprehensive income	$ 601,218	$ 368,421	$ 649,305