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Financial Instruments and Fair Value Measurements (Narrative) (Details) - Measurement Input, Discount Rate [Member] | Mar. 31, 2023 | Sep. 30, 2022
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Long-Term Debt [Member] | Weighted Average [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Interest rate used to measure long-term debt | 5.3 | 5.6
Long Term Notes Receivable from Municipalities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Interest rate used to measure municipal notes | 2.4 | 3.5
Investments in Short-Term Time Deposits [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Interest rate used to measure short-term time deposits | 6.3 | 6.1

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- Definition Value of input used to measure long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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