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Significant Accounting Policies - Schedule of Disaggregated Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Net revenues	$ 1,710.3	$ 1,619.0	$ 1,443.5
Discontinued Operations, Held-for-sale
Disaggregation of Revenue [Line Items]
Net revenues associated with suspended operations	0.0	0.0	1,174.4
Oil changes and related fees
Disaggregation of Revenue [Line Items]
Net revenues	1,247.3	1,188.7	1,074.3
Non-oil changes and related fees
Disaggregation of Revenue [Line Items]
Net revenues	368.4	350.1	297.6
Franchise fees and other
Disaggregation of Revenue [Line Items]
Net revenues	$ 94.6	$ 80.2	71.6
Franchise fees and other | Discontinued Operations, Held-for-sale
Disaggregation of Revenue [Line Items]
Net revenues associated with suspended operations			$ 0.2

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