Pensions and Other Benefit Plans - Components of Net Periodic Pension Cost (Details) - Pension Plans - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Service costs—benefits earned during the period	$ 477	$ 512	$ 707
Interest cost on projected benefit obligation	9,783	13,548	11,312
Expected return on plan assets	(7,348)	(11,459)	(10,844)
Net amortization	484	360	851
Settlement	23,634	4,984	(62)
Net periodic pension cost (benefit)	$ 27,030	$ 7,945	$ 1,964