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Fair Value Measurements and Derivative Instruments (Tables) | 9 Months Ended
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Jun. 30, 2025
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 June 30, 2025 and September 30, 2024:
|  | June 30, 2025 |
|  | Carrying Value |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Other assets: |  |  |  |  |  |  |  |  |  |  |  |
Investments held by Rabbi Trust |  | $ | 7.8 |  |  | $ | 7.8 |  |  | $ | — |  |  | $ | — |
Total assets |  | $ | 7.8 |  |  | $ | 7.8 |  |  | $ | — |  |  | $ | — |
Accrued expenses and other current liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Fuel derivative contracts |  | $ | 0.4 |  |  | $ | — |  |  | $ | 0.4 |  |  | $ | — |
Other liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivative contracts |  |  | 1.0 |  |  |  | — |  |  |  | 1.0 |  |  |  | — |
Obligation to Rabbi Trust |  |  | 7.8 |  |  |  | 7.8 |  |  |  | — |  |  |  | — |
Total liabilities |  | $ | 9.2 |  |  | $ | 7.8 |  |  | $ | 1.4 |  |  | $ | — |
|  | September 30, 2024 |
|  | Carrying Value |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Other assets: |  |  |  |  |  |  |  |  |  |  |  |
Investments held by Rabbi Trust |  | $ | 9.7 |  |  | $ | 9.7 |  |  | $ | — |  |  | $ | — |
Total assets |  | $ | 9.7 |  |  | $ | 9.7 |  |  | $ | — |  |  | $ | — |
Accrued expenses and other current liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Fuel derivative contracts |  | $ | 0.5 |  |  | $ | — |  |  | $ | 0.5 |  |  | $ | — |
Other liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivative contracts |  |  | 2.5 |  |  |  | — |  |  |  | 2.5 |  |  |  | — |
Obligation to Rabbi Trust |  |  | 9.7 |  |  |  | 9.7 |  |  |  | — |  |  |  | — |
Total liabilities |  | $ | 12.7 |  |  | $ | 9.7 |  |  | $ | 3.0 |  |  | $ | — |
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 June 30, |  |  | Nine Months Ended June 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
(Loss) Income recognized in Other comprehensive (loss) income |  | $ | (2.4 | ) |  | $ | 3.6 |  |  | $ | 5.6 |  |  | $ | — |
Net income reclassified from Accumulated other comprehensive (loss) into Interest expense |  |  | 1.2 |  |  |  | 2.8 |  |  |  | 4.5 |  |  |  | 8.4 |
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 June 30, |  |  | Nine Months Ended June 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
(Loss) recognized in Other comprehensive (loss) income |  | $ | (0.3 | ) |  | $ | (0.2 | ) |  | $ | (0.3 | ) |  | $ | (0.1 | )
Net loss (gain) reclassified from Accumulated other comprehensive (loss) into Cost of services provided |  |  | 0.1 |  |  |  | 0.1 |  |  |  | (0.4 | ) |  |  | 0.1 |

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