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Employee Retirement Plans (Periodic Service Costs) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Change in benefit obligation:      
Projected benefit obligation at beginning of period $ 61,570 $ 60,334  
Interest cost 1,972 2,327 $ 2,380
Actuarial (gain) loss 3,779 2,375  
Benefits paid (10,503) (3,466)  
Projected benefit obligations at end of year 56,818 61,570 60,334
Change in plan assets:      
Fair value of plan assets at beginning of period 52,760 51,115  
Actual return on plan assets 7,650 3,742  
Employer contribution 3,368 1,369  
Benefits paid (10,503) (3,466)  
Fair value of plan assets at end of year 53,275 52,760 $ 51,115
Funded status at end of year $ (3,543) $ (8,810)