Pension And Other Postretirement Benefit Plans (Estimated Future Benefit Payments) (Details) $ in Thousands	Mar. 31, 2021 USD ($)
Pension Benefits [Member]
2022	$ 19,611
2023	18,777
2024	18,656
2025	17,979
2026	22,893
2027 - 2031	84,154
Other Postretirement Benefits [Member]
2022	2,484
2023	2,375
2024	2,265
2025	2,173
2026	2,047
2027 - 2031	$ 8,882

Amount of benefit for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following current fiscal year.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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Amount of benefit for defined benefit plan expected to be paid in next fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in fifth fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in fourth fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in third fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in second fiscal year following current fiscal year.

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