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Fair Value Measurements (Tables) | 6 Months Ended
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Mar. 31, 2023
Fair Value Disclosures [Abstract] |
Carrying Value and Estimated Fair Value of Long-term Debt, Including Current Matur | The carrying value and estimated fair value of our total long-term debt, including current maturities, were as follows (in millions):
| March 31, 2023 |  |  | September 30, 2022 |
| Carrying |  |  | Fair |  |  | Carrying |  |  | Fair |
| Value |  |  | Value |  |  | Value |  |  | Value |
Long-term debt and finance leases, including current maturities(1) | $ | 621.6 |  |  | $ | 569.6 |  |  | $ | 615.3 |  |  | $ | 541.7 |
(1) Current and prior period long-term debts' carrying and fair values exclude net debt issuance costs.

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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