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Fair Value Measurements and Derivative Instruments (Tables) | 6 Months Ended
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Mar. 31, 2024
Derivative Instruments Gain Loss [Line Items] |
Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis | The following tables summarize the financial assets and liabilities measured at fair value on a recurring basis as of March 31, 2024 and September 30, 2023:
|  | March 31, 2024 |
|  | Carrying Value |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Other current assets: |  |  |  |  |  |  |  |  |  |  |  |
Fuel derivative contracts |  |  | 0.1 |  |  |  | — |  |  |  | 0.1 |  |  |  | — |
Other assets: |  |  |  |  |  |  |  |  |  |  |  |
Investments held by Rabbi Trust |  | $ | 11.9 |  |  | $ | 11.9 |  |  | $ | — |  |  | $ | — |
Interest rate derivative contracts |  |  | 12.4 |  |  |  | — |  |  |  | 12.4 |  |  |  | — |
Total assets |  | $ | 24.4 |  |  | $ | 11.9 |  |  | $ | 12.5 |  |  | $ | — |
Other liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Obligation to Rabbi Trust |  | $ | 11.9 |  |  | $ | 11.9 |  |  | $ | — |  |  | $ | — |
Total liabilities |  | $ | 11.9 |  |  | $ | 11.9 |  |  | $ | — |  |  | $ | — |
|  | September 30, 2023 |
|  | Carrying Value |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Other assets: |  |  |  |  |  |  |  |  |  |  |  |
Investments held by Rabbi Trust |  | $ | 10.9 |  |  | $ | 10.9 |  |  | $ | — |  |  | $ | — |
Interest rate derivative contracts |  |  | 21.3 |  |  |  | — |  |  |  | 21.3 |  |  |  | — |
Total Assets |  | $ | 32.2 |  |  | $ | 10.9 |  |  | $ | 21.3 |  |  | $ | — |
Other liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Obligation to Rabbi Trust |  | $ | 10.9 |  |  | $ | 10.9 |  |  | $ | — |  |  | $ | — |
Total Liabilities |  | $ | 10.9 |  |  | $ | 10.9 |  |  | $ | — |  |  | $ | — |
Interest Rate Contracts |
Derivative Instruments Gain Loss [Line Items] |
Summary of Effects on Consolidated Financial Statements of Designated As Cash Flow Hedges | The effects on the consolidated financial statements of the interest rate contracts which were designated as cash flow hedges were as follows:
|  | Three Months Ended March 31, |  |  | Six Months Ended March 31, |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Income (Loss) recognized in Other comprehensive income (loss) |  | $ | 10.9 |  |  | $ | 1.5 |  |  | $ | (3.6 | ) |  | $ | 1.5 |
Net income reclassified from Accumulated other comprehensive income into Interest expense |  |  | 2.8 |  |  |  | 1.3 |  |  |  | 5.6 |  |  |  | 4.3 |
Fuel Swap Contracts |
Derivative Instruments Gain Loss [Line Items] |
Summary of Effects on Consolidated Financial Statements of Designated As Cash Flow Hedges | The effects on the consolidated financial statements of the fuel swap contracts which were designated as cash flow hedges were as follows:
|  | Three Months Ended March 31, |  |  | Six Months Ended March 31, |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Income recognized in Other comprehensive income (loss) |  | $ | 0.1 |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | — |
Net gain reclassified from Accumulated other comprehensive income into Cost of services provided |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4E + Details
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- Definition Tabular disclosure for cash flow hedging instruments of (a) the location and amount of gains and losses reported in the statement of financial performance and (b) the location and fair value amounts of the instruments reported in the statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4C + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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