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Fair Value Measurements - Fair Value Assets and Liabilities Measured Using Unobservable Inputs (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2023
Sep. 24, 2022
Sep. 25, 2021
Fair Value Disclosures [Abstract]      
Beginning balance $ 23.4 $ 75.1 $ 81.8
Contingent consideration recorded at acquisition 1.1 0.0 0.0
Fair value adjustments (14.9) (39.5) (6.7)
Payments (7.6) (12.2) 0.0
Ending balance $ 2.0 $ 23.4 $ 75.1