Stockholders' Equity (Share Based Expense Allocation) (Details) - USD ($) $ in Millions	12 Months Ended
Oct. 01, 2021	Oct. 02, 2020	Sep. 27, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation	$ 191.9	$ 156.6	$ 80.1
Share-based compensation tax benefit	13.5	10.3	1.6
Capitalized stock based compensation	9.8	10.6	4.7
Cost of Sales [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share-based compensation	28.9	23.2	13.0
Research and Development Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share-based compensation	85.7	68.7	41.6
General and Administrative Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share-based compensation	$ 77.3	$ 64.7	$ 25.5

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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