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Employee Retirement Plans (Pension Plans in Excess of Plan Assets) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligations $ 56,818 $ 61,570 $ 60,334
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation 56,818 61,570  
Fair value of plan assets 53,275 52,760  
Projected benefit obligations 56,818 61,570  
Fair value of plan assets $ 53,275 $ 52,760