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Pension And Other Postretirement Benefit Plans (Components Of Company's Net Periodic Benefit Cost) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Pension Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1,319 $ 1,286 $ 2,641 $ 2,568
Interest cost 2,882 2,898 5,754 5,799
Expected return on plan assets (3,607) (3,888) (7,214) (7,776)
Net amortization and deferral 174 203 348 406
Net periodic benefit cost 768 499 1,529 997
Other Postretirement Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 23 24 47 49
Interest cost 264 266 535 530
Expected return on plan assets (14) (16) (28) (32)
Net amortization and deferral (160) (191) (320) (380)
Net periodic benefit cost $ 113 $ 83 $ 234 $ 167