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Employee Retirement Plans (Periodic Service Costs) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Change in benefit obligation:      
Projected benefit obligation at beginning of period $ 56,818 $ 61,570  
Interest cost 1,107 1,972 $ 2,327
Actuarial (gain) loss (2,888) 3,779  
Benefits paid (3,530) (10,503)  
Projected benefit obligations at end of year 51,507 56,818 61,570
Change in plan assets:      
Fair value of plan assets at beginning of period 53,275 52,760  
Actual return on plan assets (1,405) 7,650  
Employer contribution 368 3,368  
Benefits paid (3,530) (10,503)  
Fair value of plan assets at end of year 48,708 53,275 $ 52,760
Funded status at end of year $ (2,799) $ (3,543)