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Organization and Significant Accounting Policies - Advertising Costs, Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 25, 2021
Sep. 26, 2020
Sep. 28, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Advertising expenses $ 54.6 $ 37.0 $ 27.5