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Intangible Assets (Tables) | 6 Months Ended
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Mar. 31, 2026
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The following table summarizes changes in the carrying amount of goodwill during the six months ended March 31, 2026:
(In millions) |  |
Balance as of September 30, 2025 |  | $ | 658.0 |
Acquisitions (a) |  | 527.8 |
Dispositions |  | (3.4) |
Balance at March 31, 2026 |  | $ | 1,182.4 |
(a) Includes measurement period adjustments to reduce goodwill of $3.4 million for an acquisition that closed during fiscal 2025.
Schedule of Definite-Lived Intangible Assets | The following summarizes the gross carrying amounts and accumulated amortization of the Company’s intangible assets:
|  | March 31, 2026 |  | September 30, 2025
(In millions) |  | Gross carrying amount |  | Accumulated amortization |  | Net carrying amount |  | Gross carrying amount |  | Accumulated amortization |  | Net carrying amount
Definite-lived intangible assets |  |  |  |  |  |  |  |  |  |  |  |
Trademarks and trade names |  | $ | 37.5 |  |  | $ | (14.4) |  |  | $ | 23.1 |  |  | $ | 29.5 |  |  | $ | (12.7) |  |  | $ | 16.8 |
Reacquired franchise rights |  | 126.1 |  |  | (69.0) |  |  | 57.1 |  |  | 122.3 |  |  | (63.9) |  |  | 58.4 |
Customer relationships |  | 25.7 |  |  | (9.2) |  |  | 16.5 |  |  | 14.7 |  |  | (8.5) |  |  | 6.2 |
Other intangible assets |  | 7.6 |  |  | (6.5) |  |  | 1.1 |  |  | 7.4 |  |  | (6.3) |  |  | 1.1 |
Total definite-lived intangible assets |  | $ | 196.9 |  |  | $ | (99.1) |  |  | $ | 97.8 |  |  | $ | 173.9 |  |  | $ | (91.4) |  |  | $ | 82.5 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | The table that follows summarizes the actual and estimated amortization expense for the Company's current amortizable intangible assets:
|  | Actual |  | Estimated
|  | Six months ended March 31 |  | Years ended September 30
(In millions) |  | 2026 |  | 2026 |  | 2027 |  | 2028 |  | 2029 |  | 2030 |  |
Amortization expense |  | $ | 7.6 |  |  | $ | 16.0 |  |  | $ | 16.2 |  |  | $ | 16.1 |  |  | $ | 13.8 |  |  | $ | 12.2 |  |  |

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