Annual report pursuant to Section 13 and 15(d)

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

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Employee Benefit Plans - Components of Postretirement Benefit Expense (Income) and Pension Cost (Benefit) (Detail) - Other Postretirement Benefit Plans [Member] - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Defined Benefit Plan Disclosure [Line Items]      
Interest cost on projected benefit obligation $ 15 $ 13 $ 18
Amortization of actuarial loss 12 25 27
Net pension (benefit) cost and postretirement benefit expense $ 27 $ 38 $ 45