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Significant Accounting Policies - Schedule of Disaggregation of Sales by Timing of Revenue Recognized (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Revenue from External Customer [Line Items]
Net revenues	$ 1,710.3	$ 1,619.0	$ 1,443.5
Franchise fees and other
Revenue from External Customer [Line Items]
Net revenues	94.6	80.2	71.6
Transferred at Point in Time
Revenue from External Customer [Line Items]
Net revenues	1,622.4	1,543.0	1,375.0
Transferred over Time | Franchise fees and other
Revenue from External Customer [Line Items]
Net revenues	$ 87.9	$ 76.0	$ 68.5

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