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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 | 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

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