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Employee Benefit Plans (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation $ 170,300 $ 178,500  
Company's expected contribution to defined benefit pension plans in next fiscal year 9,400    
Expense for defined contribution plans $ 14,400 13,900 $ 10,600
Deferred Compensation Plan      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of vested salary and incentive compensation deferrals permitted to eligible employees (as a percent) 100.00%    
Investments for deferred compensation plan $ 28,213 28,431  
Deferred Compensation Plan | Other Assets      
Defined Benefit Plan Disclosure [Line Items]      
Investments for deferred compensation plan 28,200 28,400  
Deferred Compensation Plan | Other Liabilities      
Defined Benefit Plan Disclosure [Line Items]      
Investments for deferred compensation plan $ 28,200 $ 28,400  
Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations (as a percent) 33.00%    
Debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations (as a percent) 28.00%    
Real estate funds      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations (as a percent) 28.00%    
Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations (as a percent) 4.00%