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Supplemental Financial Information - Disaggregation of Sales by Timing of Revenue Recognized and Revenue by Category (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue [Line Items]
Net revenues	$ 503.8	$ 403.2	$ 965.6	$ 817.5
Oil changes and related fees
Disaggregation of Revenue [Line Items]
Net revenues	368.4	291.0	706.1	592.7
Non-oil changes and related fees
Disaggregation of Revenue [Line Items]
Net revenues	110.6	89.9	211.1	181.3
Franchise fees and other
Disaggregation of Revenue [Line Items]
Net revenues	24.8	22.3	48.4	43.5
Net revenues transferred at a point in time
Disaggregation of Revenue [Line Items]
Net revenues	479.7	381.7	918.9	775.8
Franchised revenues transferred over time
Disaggregation of Revenue [Line Items]
Net revenues	$ 24.1	$ 21.5	$ 46.7	$ 41.7

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