Significant Accounting Policies - Schedule of Disaggregated Revenues (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Net revenues	$ 335.4	$ 317.4	$ 296.0	$ 287.3	$ 295.2	$ 281.6	$ 244.9	$ 215.5	$ 1,236.1	$ 1,037.2	$ 727.0
Oil changes and related fees
Disaggregation of Revenue [Line Items]
Net revenues									906.7	756.7	527.0
Non-oil changes and related fees
Disaggregation of Revenue [Line Items]
Net revenues									248.3	207.9	142.5
Franchise fees and other
Disaggregation of Revenue [Line Items]
Net revenues									$ 81.1	$ 72.6	$ 57.5