Employee Stock Plans (Stock-Based Compensation Expense Recognized in Consolidated Statement of Earnings) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 41.4	$ 63.3	$ 188.0	$ 255.4
Stock Options [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	1.4	2.4	3.8	17.9
Restricted Stock Units (RSUs) [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 40.0	$ 60.9	$ 184.2	$ 237.5