XML 56 R46.htm IDEA: XBRL DOCUMENT v3.24.0.1
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, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Pension Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1,280 $ 1,549 $ 3,848 $ 4,597
Interest cost 2,897 2,341 8,696 7,027
Expected return on plan assets (3,887) (3,323) (11,663) (9,971)
Net amortization and deferral 205 1,001 611 3,003
Net periodic benefit cost 495 1,568 1,492 4,656
Other Postretirement Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 24 33 73 97
Interest cost 263 236 793 712
Expected return on plan assets (15) (18) (47) (56)
Net amortization and deferral (189) (168) (569) (507)
Net periodic benefit cost $ 83 $ 83 $ 250 $ 246