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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, 2024 | Sep. 30, 2023
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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 | $ (56,783) | $ (49,726)
Accumulated benefit obligation, plans with ABO in excess of plan assets | (56,757) | (49,711)
Fair value of plan assets, plans with ABO in excess of plan assets | 20,053 | 18,047
Plans with accumulated benefit obligation less than plan assets |  |
Projected benefit obligation, plans with ABO less than plan assets | (161,519) | (144,759)
Accumulated benefit obligation, plans with ABO less than plan assets | (160,302) | (143,914)
Fair value of plan assets, plans with ABO less than plan assets | $ 217,340 | $ 188,098

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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/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-3 + Details
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