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Pensions and Other Benefit Plans - Components of Net Periodic Pension Cost (Details) - Pension Plans - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Defined Benefit Plan Disclosure [Line Items]      
Service costs—benefits earned during the period $ 512 $ 707 $ 980
Interest cost on projected benefit obligation 13,548 11,312 10,130
Expected return on plan assets (11,459) (10,844) (13,037)
Net amortization 360 851 1,457
Settlement 4,984 (62) 0
Net periodic pension cost (benefit) $ 7,945 $ 1,964 $ (470)