Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Components of Postretirement Benefit Cost (Income) and Pension Cost (Benefit) (Detail)

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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, 2023
Mar. 31, 2022
Mar. 31, 2021
Defined Benefit Plan Disclosure [Line Items]      
Service cost during the period $ 333 $ 373 $ 461
Interest cost on projected benefit obligation 1,185 1,147 1,211
Expected return on assets (2,169) (2,727) (2,513)
Actuarial loss 633 669 1,039
Net pension (benefit) cost and postretirement benefit expense $ (18) $ (538) $ 198