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Investments and Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 26, 2025
Sep. 27, 2024
Sep. 29, 2023
Fair Value Disclosures [Abstract]      
Payments to acquire equity method investments $ 76.0    
Equity Securities without Readily Determinable Fair Value, Amount 11.8 $ 5.0  
Equity Securities, FV-NI, Gain (Loss) 24.1 14.2 $ 5.1
Equity Method Investments $ 68.5 $ 84.3