Pensions and Other Benefit Plans - Reconciliation of Benefit Obligation, Plan Assets, and Funded Status (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Change in plan assets:
Fair value of plan assets at beginning of year	$ 231,667
Fair value of plan assets at end of year	199,592	$ 231,667
Pension Plans
Change in benefit obligation:
Benefit obligation at beginning of year	300,210	356,974
Service cost	512	707	$ 980
Interest cost	13,548	11,312	10,130
Actuarial (gain) loss	(2,754)	(42,652)
Benefits paid	(22,650)	(23,980)
Settlement	(20,510)	0
Foreign exchange rate changes	(331)	(2,151)
Benefit obligation at end of year	268,025	300,210	356,974
Change in plan assets:
Fair value of plan assets at beginning of year	231,667	271,985
Actual gain (loss) on plan assets	4,328	(20,735)
Employer contribution	6,761	4,796
Benefits paid	(22,650)	(23,980)
Settlement	(20,510)	0
Foreign exchange rate changes	(4)	(399)
Fair value of plan assets at end of year	199,592	231,667	$ 271,985
Funded status	(68,433)	(68,543)
Unrecognized actuarial loss	16,229	17,169
Net amount recognized	$ (52,204)	$ (51,374)