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Retirement Benefits (Schedule of Accumulated Benefit Obligations In Excess of and Less Than Fair Value of Plan Assets) (Details) - Defined Benefit Pension Plan [Member] - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019
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Plans with accumulated benefit obligation in excess of plan assets |  |
Projected benefit obligation, plans with ABO in excess of plan assets | $ (141,561) | $ (286,495)
Accumulated benefit obligation, plans with ABO in excess of plan assets | (140,623) | (284,368)
Fair value of plan assets, plans with ABO in excess of plan assets | 79,963 | 222,661
Plans with accumulated benefit obligation less than plan assets |  |
Projected benefit obligation, plans with ABO less than plan assets | (166,062) | (10,635)
Accumulated benefit obligation, plans with ABO less than plan assets | (165,321) | (9,605)
Fair value of plan assets, plans with ABO less than plan assets | $ 186,746 | $ 11,472

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- Definition 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 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920 + Details
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