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Fair Value Measurements (Tables) | 9 Months Ended
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Jun. 30, 2024
Fair Value Disclosures [Abstract] |
Carrying Value and Estimated Fair Value of Long-term Debt and Finance Leases, Including Current Maturities | The carrying value and estimated fair value of our total long-term debt and finance leases, including current maturities, were as follows (in millions):
| June 30, 2024 |  |  | September 30, 2023 |
| Carrying |  |  | Fair |  |  | Carrying |  |  | Fair |
| Value |  |  | Value |  |  | Value |  |  | Value |
Long-term debt and finance leases, including current maturities(1) | $ | 366.4 |  |  | $ | 346.4 |  |  | $ | 538.3 |  |  | $ | 493.6 |
(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 -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 + Details
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