Stockholder's Equity (Share Based Compensation) (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 30, 2018	Mar. 31, 2017	Mar. 30, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Treasury Stock, Shares, Acquired	1.0		2.7
Share-based compensation expense	$ 41.0	$ 22.1	$ 66.8	$ 43.7
Cost of sales [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	4.2	3.4	8.3	7.2
Research and development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	14.5	8.5	25.7	16.8
Selling, general and administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	$ 22.3	$ 10.2	$ 32.8	$ 19.7