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Summary of Significant Accounting Policies - Supplemental Cash Flow Statement Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 25, 2021
Sep. 26, 2020
Sep. 28, 2019
Accounting Policies [Abstract]      
Cash paid during the period for income taxes $ 615.1 $ 265.9 $ 180.6
Cash paid during the period for interest 93.2 109.5 132.5
Contingent consideration recorded at acquisition $ 0.0 $ 82.7 $ 0.0