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Executive Stock Plans And Stock-Based Compensation (Summary Of RSU, Restricted Stock, And PSA Activity) (Details) - $ / shares
shares in Thousands
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2020
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted, Shares 117,103 100,105 93,564  
Vested, Shares (109,877) (67,239) (86,488)  
Forfeited, Shares 0 0 0  
Unvested at end of year, Shares 389,636 382,410 349,544 342,468
Granted, Weighted- Average Grant Date Fair Value $ 51.90 $ 60.89 $ 56.18  
Vested, Weighted- Average Grant Date Fair Value 61.75 62.39 54.33  
Forfeited, Weighted- Average Grant Date Fair Value 0 0 0  
Unvested at end of year, Weighted- Average Grant Date Fair Value $ 53.18 $ 56.03 $ 55.86 $ 55.44
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted, Shares 0 0 0  
Vested, Shares 0 0 0  
Forfeited, Shares 0 0 0  
Unvested at end of year, Shares 11,600 11,600 11,600 11,600
Granted, Weighted- Average Grant Date Fair Value $ 0 $ 0 $ 0  
Vested, Weighted- Average Grant Date Fair Value 0 0 0  
Forfeited, Weighted- Average Grant Date Fair Value 0 0 0  
Unvested at end of year, Weighted- Average Grant Date Fair Value $ 41.86 $ 41.86 $ 41.86 $ 41.86
Performance Share Awards Psas [Member        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted, Shares 65,645 48,315 48,650  
Vested, Shares (73,963) (37,040) (50,242)  
Forfeited, Shares (467) (9,260) (1,555)  
Unvested at end of year, Shares 151,230 160,015 158,000 161,147
Granted, Weighted- Average Grant Date Fair Value $ 43.01 $ 54.46 $ 47.95  
Vested, Weighted- Average Grant Date Fair Value 34.45 50.16 57.12  
Forfeited, Weighted- Average Grant Date Fair Value 34.33 50.16 57.12  
Unvested at end of year, Weighted- Average Grant Date Fair Value $ 48.22 $ 44.55 $ 43.16 $ 46.20