Supplemental Financial Information - Disaggregation of Sales by Timing of Revenue Recognized and Revenue by Category (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Net revenues	$ 414.3	$ 373.4
Oil changes and related fees
Disaggregation of Revenue [Line Items]
Net revenues	301.7	277.5
Non-oil changes and related fees
Disaggregation of Revenue [Line Items]
Net revenues	91.4	78.2
Franchise fees and other
Disaggregation of Revenue [Line Items]
Net revenues	21.2	17.7
Net revenues transferred at a point in time
Disaggregation of Revenue [Line Items]
Net revenues	394.1	355.9
Franchised revenues transferred over time
Disaggregation of Revenue [Line Items]
Net revenues	$ 20.2	$ 17.5