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Employee Retirement Plans (Pension Plans in Excess of Plan Assets) (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Apr. 30, 2021
Mar. 31, 2021
Mar. 31, 2020
Defined Benefit Plan Disclosure [Line Items]        
Projected benefit obligations $ 51,507   $ 56,818 $ 61,570
Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Accumulated benefit obligation 51,507   56,818  
Fair value of plan assets 48,708   53,275  
Projected benefit obligations 51,507 $ 47,200 56,818  
Fair value of plan assets $ 48,708   $ 53,275