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) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Defined Benefit Plan Disclosure [Line Items]      
Net pension (benefit) cost and postretirement benefit expense $ 1,000    
Other Postretirement Benefit Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Interest cost on projected benefit obligation 13 $ 18 $ 22
Amortization of actuarial loss 25 27 28
Net pension (benefit) cost and postretirement benefit expense $ 38 $ 45 $ 50