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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 24, 2016
Statement of Comprehensive Income [Abstract]      
Changes in unrealized holding gains and losses on available-for-sale securities, tax $ 0.2 $ 0.1  
Changes in pension plans, taxes (0.6) 1.1 $ 0.3
Changes in value of hedged interest rate caps, tax $ (5.0) $ 0.6 $ 2.0