v3.26.1
Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Sep. 30, 2025
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount $ 196.6 $ 173.9
Accumulated amortization (103.1) (91.4)
Net carrying amount 93.5 82.5
Trademarks and trade names    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 37.5 29.5
Accumulated amortization (15.4) (12.7)
Net carrying amount 22.1 16.8
Reacquired franchise rights    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 126.0 122.3
Accumulated amortization (71.6) (63.9)
Net carrying amount 54.4 58.4
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 25.5 14.7
Accumulated amortization (9.4) (8.5)
Net carrying amount 16.1 6.2
Other intangible assets    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 7.6 7.4
Accumulated amortization (6.7) (6.3)
Net carrying amount $ 0.9 $ 1.1