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Pension And Other Postretirement Benefit Plans (Additional Information On Funded Status) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Mar. 31, 2019
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Pension Benefits [Member] |  |
For Plans With A Projected Benefit Obligation In Excess Of Plan Assets: |  |
Aggregate projected benefit obligation (PBO) | $ 284,327 | $ 269,622
Aggregate fair value of plan assets | 235,349 | 234,565
For Plans With An Accumulated Benefit Obligation In Excess Of Plan Assets: |  |
Aggregate accumulated benefit obligation (ABO) | 278,515 | 35,070
Aggregate fair value of plan assets | 235,349 | 4,023
Other Postretirement Benefits [Member] |  |
For Plans With A Projected Benefit Obligation In Excess Of Plan Assets: |  |
Aggregate projected benefit obligation (PBO) | 30,282 | 31,635
Aggregate fair value of plan assets | $ 3,369 | $ 3,717

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