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Income Taxes (Income Tax Benefits Realized from the Exercise of Nonqualified Stock Options, and Disqualifying Dispositions of Stock Sold Under our Employee Stock Purchase Plans) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 28, 2018
Sep. 29, 2017
Sep. 30, 2016
Income Tax Disclosure [Abstract]      
Income tax benefits realized under stock plans $ 4.7 $ 5.2 $ 1.5