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)

v3.23.1
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, 2023
Mar. 31, 2022
Mar. 31, 2021
Pension Plans, Defined Benefit [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation at beginning of year $ 32,991 $ 36,320  
Service cost 333 373 $ 461
Interest cost 1,185 1,147 1,211
Actuarial loss (gain) (5,364) (2,486)  
Benefit payments (1,116) (1,084)  
Liability released through annuity purchase (1,383) (1,279)  
Projected benefit obligation at end of year 26,646 32,991 36,320
Change in fair value of plan assets      
Fair value of plan assets at beginning of year 40,049 42,536  
Actual return on plan assets (4,797) (124)  
Benefit payments (1,116) (1,084)  
Annuities purchased (1,383) (1,279)  
Fair value of plan assets at end of year 32,753 40,049 42,536
Funded status      
Funded status at end of year 6,107 7,058  
Amount recognized in the Consolidated Balance Sheets 6,107 7,058  
Other Postretirement Benefit Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation at beginning of year 478 587  
Interest cost 15 13 18
Actuarial loss (gain) (95) (66)  
Benefit payments (43) (56)  
Projected benefit obligation at end of year 355 478 $ 587
Change in fair value of plan assets      
Employer contribution 43 56  
Benefit payments (43) (56)  
Funded status      
Funded status at end of year (355) (478)  
Amount recognized in the Consolidated Balance Sheets $ (355) $ (478)