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Pension And Other Postretirement Benefit Plans (Additional Information On Funded Status) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Mar. 31, 2020
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Pension Benefits [Member] |  |
For Plans With A Projected Benefit Obligation In Excess Of Plan Assets: |  |
Aggregate projected benefit obligation (PBO) | $ 44,742 | $ 284,327
Aggregate fair value of plan assets | 6,051 | 235,349
For Plans With An Accumulated Benefit Obligation In Excess Of Plan Assets: |  |
Aggregate accumulated benefit obligation (ABO) | 42,923 | 278,515
Aggregate fair value of plan assets | 6,051 | 235,349
Other Postretirement Benefits [Member] |  |
For Plans With A Projected Benefit Obligation In Excess Of Plan Assets: |  |
Aggregate projected benefit obligation (PBO) | 28,926 | 30,282
Aggregate fair value of plan assets | $ 3,033 | $ 3,369

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