Pensions and Other Benefit Plans - Reconciliation of Benefit Obligation, Plan Assets, and Funded Status (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Change in plan assets:
Fair value of plan assets at beginning of year	$ 199,592
Fair value of plan assets at end of year	94,240	$ 199,592
Pension Plans
Change in benefit obligation:
Benefit obligation at beginning of year	268,025	300,210
Service cost	477	512	$ 707
Interest cost	9,783	13,548	11,312
Actuarial (gain) loss	(5,937)	(2,754)
Benefits paid	(18,733)	(22,650)
Settlement	(95,080)	(20,510)
Foreign exchange rate changes	94	(331)
Benefit obligation at end of year	158,629	268,025	300,210
Change in plan assets:
Fair value of plan assets at beginning of year	199,592	231,667
Actual gain (loss) on plan assets	10,327	4,328
Employer contribution	5,136	6,761
Benefits paid	(18,733)	(22,650)
Settlement	(95,080)	(20,510)
Assets transferred out related to plan termination (see below)	(6,974)	0
Foreign exchange rate changes	(28)	(4)
Fair value of plan assets at end of year	94,240	199,592	$ 231,667
Funded status	(64,389)	(68,433)
Unrecognized actuarial loss	(16,867)	16,229
Net amount recognized	$ (81,256)	$ (52,204)