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)

v3.22.1
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, 2022
Mar. 31, 2021
Mar. 31, 2020
Pension Plans, Defined Benefit [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation at beginning of year $ 36,320 $ 35,783  
Service cost 373 461 $ 496
Interest cost 1,147 1,211 1,290
Actuarial (gain) loss (2,486) 1,284  
Benefit payments (1,084) (942)  
Liability released through annuity purchase (1,279) (1,477)  
Projected benefit obligation at end of year 32,991 36,320 35,783
Change in fair value of plan assets      
Fair value of plan assets at beginning of year 42,536 39,243  
Actual return on plan assets (124) 5,712  
Benefit payments (1,084) (942)  
Annuities purchased (1,279) (1,477)  
Fair value of plan assets at end of year 40,049 42,536 39,243
Funded status      
Funded status at end of year 7,058 6,216  
Amount recognized in the Consolidated Balance Sheets 7,058 6,216  
Other Postretirement Benefit Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation at beginning of year 587 634  
Interest cost 13 18 22
Actuarial (gain) loss (66) (3)  
Benefit payments (56) (62)  
Projected benefit obligation at end of year 478 587 $ 634
Change in fair value of plan assets      
Employer contribution 56 62  
Benefit payments (56) (62)  
Funded status      
Funded status at end of year (478) (587)  
Amount recognized in the Consolidated Balance Sheets $ (478) $ (587)