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Employee Retirement Plans (Narrative) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Apr. 30, 2022
Dec. 31, 2020
Jun. 30, 2022
USD ($)
Dec. 31, 2020
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Defined contribution plan, minimum annual contributions per participating employee (as percent)         1.00%    
Defined contribution plan, maximum annual contributions per employee (as percent)         70.00%    
Defined contribution plan, cost recognized         $ 1,900 $ 1,700 $ 1,600
Lump sum settlement of terminated plan     $ 13,800        
Payment for settlement, purchase of annuity contract     31,100        
Settlement gain (loss)     $ (400) $ 200      
Projected benefit obligations         $ 3,646 51,507 56,818
Lump sum payout       $ 7,000      
Defined benefit plan, remeasurement, discount rate   0.0251   0.0251      
Defined benefit plan, assumptions used calculating benefit obligation, discount rate   2.75%   2.75%      
Expected return on plan assets, net of administrative fees (as percent)         2.75%    
Qualified plan              
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Contributions to the qualified plan         $ 0 $ 0 $ 3,000
Expected return on plan assets, net of administrative fees (as percent) 2.75% 2.75%     2.75% 2.25% 5.00%
Unfunded plan              
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Projected benefit obligations         $ 3,600 $ 4,300  
Contribution Tranche One              
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Defined contribution plan, employer matching contribution, percent of match (as percent)         100.00%    
Defined contribution plan, employer matching contribution, percent of employees pay (as percent)         3.00%    
Contribution Tranche Two              
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Defined contribution plan, employer matching contribution, percent of match (as percent)         50.00%    
Defined contribution plan, employer matching contribution, percent of employees pay (as percent)         3.00%