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Employee Retirement Plans (Periodic Service Costs) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Change in benefit obligation:      
Projected benefit obligation at beginning of period $ 51,507 $ 56,818  
Interest cost 423 1,107 $ 1,972
Actuarial (gain) loss (2,044) (2,888)  
Benefits paid (46,240) (3,530)  
Projected benefit obligations at end of year 3,646 51,507 56,818
Change in plan assets:      
Fair value of plan assets at beginning of period 48,708 53,275  
Actual return on plan assets (2,820) (1,405)  
Employer contribution 370 368  
Benefits paid (1,371) (3,530)  
Settlements paid with termination of qualified plan (44,869) 0  
Fair value of plan assets at end of year 18 48,708 $ 53,275
Funded status at end of year $ (3,628) $ (2,799)  
Defined Benefit Plan Net Periodic Benefit Cost Credit Expected Return Loss Statement Of Income Or Comprehensive Income Extensible List Not Disclosed Flag Actuarial (gain) loss Actuarial (gain) loss Actuarial (gain) loss
Defined Benefit Plan Net Periodic Benefit Cost Credit Interest Cost Statement Of Income Or Comprehensive Income Extensible List Not Disclosed Flag Interest cost Interest cost Interest cost