v3.25.4
Pension And Other Postretirement Benefit Plans (Components Of Company's Net Periodic Benefit Cost) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2025
Dec. 31, 2024
Pension Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1,260 $ 1,315 $ 3,771 $ 3,956
Interest cost 2,261 2,875 6,796 8,629
Expected return on plan assets (3,026) (3,606) (9,080) (10,820)
Net amortization and deferral 84 174 250 522
Net periodic benefit cost 579 758 1,737 2,287
Other Postretirement Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 18 22 52 69
Interest cost 266 259 794 794
Expected return on plan assets (10) (13) (32) (41)
Net amortization and deferral (159) (157) (480) (477)
Net periodic benefit cost $ 115 $ 111 $ 334 $ 345