Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Changes in Company's Benefit Obligation, Plan Assets and Funded Status for Plan (Detail)

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Employee Benefit Plans - Changes in Company's Benefit Obligation, Plan Assets and Funded Status for Plan (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Pension Plans, Defined Benefit [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation at beginning of year $ 26,646 $ 32,991  
Service cost 252 333 $ 373
Interest cost 1,312 1,185 1,147
Actuarial gain (726) (5,364)  
Benefit payments (990) (1,116)  
Liability released through annuity purchase (1,452) (1,383)  
Projected benefit obligation at end of year 25,042 26,646 32,991
Change in fair value of plan assets      
Fair value of plan assets at beginning of year 32,753 40,049  
Actual return on plan assets 1,127 (4,797)  
Benefit payments (990) (1,116)  
Annuities purchased (1,452) (1,383)  
Fair value of plan assets at end of year 31,438 32,753 40,049
Funded status      
Funded status at end of year 6,396 6,107  
Amount recognized in the Consolidated Balance Sheets 6,396 6,107  
Other Postretirement Benefit Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation at beginning of year 355 478  
Interest cost 15 15 13
Actuarial gain (15) (95)  
Benefit payments (44) (43)  
Projected benefit obligation at end of year 311 355 $ 478
Change in fair value of plan assets      
Employer contribution 44 43  
Benefit payments (44) (43)  
Funded status      
Funded status at end of year (311) (355)  
Amount recognized in the Consolidated Balance Sheets $ (311) $ (355)