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Employee Benefit Plans - Components of Postretirement Benefit Cost (Income) and Pension Cost (Benefit) (Detail) - Pension Plans, Defined Benefit [Member] - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Defined Benefit Plan Disclosure [Line Items]      
Service cost during the period $ 252 $ 252 $ 333
Interest cost on projected benefit obligation 1,292 1,312 1,185
Expected return on assets (1,778) (1,851) (2,169)
Actuarial loss 781 843 633
Net pension (benefit) cost and postretirement benefit expense $ 547 $ 556 $ (18)