Pension And Other Postretirement Benefit Plans (Additional Information On Funded Status) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Mar. 31, 2019
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

Amount of plan asset for defined benefit pension plan with projected benefit obligation in excess of plan assets.

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- Definition

Amount of projected benefit obligation for defined benefit pension plan with projected benefit obligation in excess of plan assets.

+ References

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Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
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Amount of plan asset for defined benefit plan with accumulated benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
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For plans with an accumulated benefit obligation in excess of plan assets:

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For plans with a projected benefit obligation in excess of plan assets

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