Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Additional Information (Detail)

v3.22.1
Employee Benefit Plans - Additional Information (Detail) - USD ($)
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Defined Benefit Plan Disclosure [Line Items]      
Employee's years of service and average earnings five highest consecutive calendar years of compensation in the ten-year period preceding retirement    
Accumulated benefit obligation $ 29,943,000 $ 32,861,000  
Pension expense $ 1,000,000    
Contribution equal to employee salary deferral 100.00%    
Employer contribution description matching contributions equal to 100% of the first 3% of an employee's salary deferral and 50% of the next 2% percent of an employee’s salary deferral    
Contribution next to employee salary deferral 3.00%    
Contribution for additional employee salary deferral 50.00%    
Contribution additional next to employee salary deferral 2.00%    
Share of the medical premium cost for family coverage $ 4,000    
Share of the medical premium cost for single coverage 2,000    
Share of the medical premium both family and single coverage for regular retirees $ 1,000    
Medical care cost trend rate 4.50%    
Medical care trend year 2026    
Medical care cost trend rate decrements 0.50%    
Current portion of accrued postretirement benefit obligation $ 63,000 72,000  
Stop loss coverage per employee for claims $ 100    
Total plan amount $ 2,867,000    
Self-Insured medical plan liability 116,000 184,000  
Defined Contribution Plan 401K [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Contributions to defined contribution plan 1,365,000 863,000 $ 1,000,000
Pension Plans, Defined Benefit [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Contributions expected during fiscal 2021 0    
Liability released through annuity purchase 1,279,000 1,477,000  
Annuities purchased 1,279,000 1,477,000  
Pension expense $ (538,000) $ 198,000 $ 98,000
Weighted average discount rates used to develop net postretirement benefit cost 3.21% 3.44% 3.83%
Weighted average rate of increase in compensation levels 3.00% 3.00% 3.00%
Projected benefit obligation $ 32,991,000 $ 36,320,000 $ 35,783,000
Net actuarial loss recognized in accumulated other comprehensive loss, net of income tax 6,753,000 6,990,000  
Defined Contribution Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Contributions to defined contribution plan 710,000 430,000 406,000
Supplemental Executive Retirement Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Pension expense $ 346,000 $ 105,000 $ 85,000
Weighted average discount rates used to develop net postretirement benefit cost 3.21% 3.44% 3.83%
Weighted average rate of increase in compensation levels 3.00% 3.00% 3.00%
Projected benefit obligation $ 1,320,000 $ 1,557,000  
Net actuarial loss recognized in accumulated other comprehensive loss, net of income tax (123,000) (544,000)  
Other Postretirement Benefit Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Pension expense $ 38,000 $ 45,000 $ 50,000
Weighted average discount rates used to develop net postretirement benefit cost 2.34% 3.01% 3.37%
Projected benefit obligation $ 478,000 $ 587,000 $ 634,000
Net actuarial loss recognized in accumulated other comprehensive loss, net of income tax $ 94,000 $ 164,000