Annual report [Section 13 and 15(d), not S-K Item 405]

Employee Benefit Plans - Additional Information (Detail)

v3.26.1
Employee Benefit Plans - Additional Information (Detail) - USD ($)
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
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 $ 21,208,000 $ 21,351,000  
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%    
Defined Contribution Plan 401K [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Contributions to defined contribution plan $ 2,900,000 2,455,000 $ 1,914,000
Pension Plans, Defined Benefit [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Contributions expected during fiscal 2021 0    
Annuities purchased 1,056,000 1,458,000  
Pension expense $ 711,000 $ 547,000 $ 556,000
Weighted average discount rates used to develop net postretirement benefit cost 5.53% 5.27% 5.03%
Weighted average rate of increase in compensation levels 3.00% 3.00% 3.00%
Projected benefit obligation $ 23,001,000 $ 23,876,000 $ 25,042,000
Net actuarial (gain) loss recognized in accumulated other comprehensive loss, net of income tax 5,680,000 6,767,000  
Defined Contribution Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Contributions to defined contribution plan 1,502,000 1,382,000 1,237,000
Supplemental Executive Retirement Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Pension expense $ 43,000 $ 54,000 $ 54,000
Weighted average discount rates used to develop net postretirement benefit cost 5.50% 5.26% 5.01%
Weighted average rate of increase in compensation levels 3.00% 3.00% 3.00%
Projected benefit obligation $ 993,000 $ 1,019,000  
Net actuarial (gain) loss recognized in accumulated other comprehensive loss, net of income tax $ (89,000) $ (89,000)