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Employee Benefit Plans (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation $ 227,700 $ 184,800  
Company's expected contribution to defined benefit pension plans in next fiscal year 8,000    
Expense for defined contribution plans 13,700 14,400 $ 14,400
Fair value of marketable securities 29,000 29,200  
Obligation for deferred compensation plan $ 29,000 29,200  
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%    
Obligation for deferred compensation plan $ 29,006 $ 29,174  
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%