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) - 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    
Pension Plans, Defined Benefit [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost during the period 373 $ 461 $ 496
Interest cost on projected benefit obligation 1,147 1,211 1,290
Expected return on assets (2,727) (2,513) (2,657)
Actuarial loss 669 1,039 969
Net pension (benefit) cost and postretirement benefit expense $ (538) $ 198 $ 98