Employee Benefit Plans (Changes in Projected Benefit Obligations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Changes in projected benefit obligations
Projected benefit obligations, beginning of the year	$ 195,336	$ 207,551
Service costs	11,479	13,195	$ 14,693
Interest costs	3,844	2,408	920
Plan participant contributions	6,731	6,870
Actuarial loss (gain)	13,737	(22,965)
Benefits paid	(2,405)	(2,646)
Transfer of prior vested benefits	6,775	11,579
Plan amendments	380	0
Settlement	(22,522)	(15,348)
Curtailment	0	(3,923)
Administrative expense paid	(158)	(147)
Currency exchange rate changes	280	(1,238)
Projected benefit obligations, end of the year	$ 213,477	$ 195,336	$ 207,551