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Fair Value Measurements - Fair Value Assets and Liabilities Measured Using Unobservable Inputs (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 25, 2021
Sep. 26, 2020
Sep. 28, 2019
Fair Value Disclosures [Abstract]      
Beginning balance $ 81.8 $ 9.1 $ 7.8
Contingent consideration recorded at acquisition 0.0 82.7 0.0
Fair value adjustments (6.7) 0.3 1.7
Payments/Accruals 0.0 (10.3) (0.4)
Ending balance $ 75.1 $ 81.8 $ 9.1