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Intangible Assets (Tables)
 6 Months Ended
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, 2026September 30, 2025
(In millions)Gross carrying amountAccumulated amortizationNet carrying amountGross carrying amountAccumulated amortizationNet carrying amount
Definite-lived intangible assets
Trademarks and trade names $37.5 $(14.4)$23.1 $29.5 $(12.7)$16.8 
Reacquired franchise rights126.1 (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 assets7.6 (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:

ActualEstimated
Six months ended
March 31		Years ended September 30
(In millions)202620262027202820292030
Amortization expense$7.6 $16.0 $16.2 $16.1 $13.8 $12.2