Stockholder's Equity (Share Based Compensation) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 02, 2021	Mar. 27, 2020	Apr. 02, 2021	Mar. 27, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Document Period End Date			Apr. 02, 2021
Share-based compensation expense	$ 56.4	$ 40.2	$ 100.8	$ 73.8
Cost of sales [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation expense	12.7	7.2	19.1	11.4
Research and development [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation expense	24.0	17.2	44.3	32.0
Selling, general and administrative [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation expense	$ 19.7	$ 15.8	$ 37.4	$ 30.4