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Employee Benefit Plans (Narratives) (Details)
 12 Months Ended
Mar. 31, 2025
USD ($)
Age
shares
Mar. 31, 2024
USD ($)
shares
Mar. 31, 2023
USD ($)
shares
Compensation of related costs, Share-based Payments [Abstract]      
Employee stock ownership plan (ESOP), compensation expense $ 30,200,000 $ 23,900,000 $ 22,100,000
Cash contributions to ESOP non leveraged $ 30,200,000 $ 23,900,000 $ 22,100,000
Employee stock ownership plan number of non-leveraged shares purchased for allocation | shares 469,998 365,544 424,484
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]      
Defined benefit plan, health care cost trend rate assumed for next fiscal year 5.80% 0.90%  
Defined benefit plan, ultimate health care cost trend rate 4.00% 4.00%  
Defined benefit plan, year rate reaches ultimate trend rate 2047    
Defined Benefit Plan Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate 2047    
Post retirement health insurance [Member]      
Deferred Compensation Arrangements [Abstract]      
Lifetime maximum benefit paid per individual $ 20,000    
Post retirement life insurance [Member]      
Deferred Compensation Arrangements [Abstract]      
Age requirement for retiring | Age 65    
Deferred compensation arrangement with individual, requisite service period 20 years    
Lifetime maximum benefit paid per individual $ 3,000    
Additional benefit requirement amount $ 100