Basis of Presentation And Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 30, 2022
Change in Accounting Estimate [Line Items]
Decrease in depreciation expense	$ 264.8	$ 387.8	$ 394.4
Decrease in cost of goods sold	2,457.2	2,665.1	2,881.2
Decrease in research and development	631.7	606.8	617.9
Increase in net income	$ 596.0	$ 982.8	$ 1,275.2
Increase in diluted EPS (in dollars per share)	$ 3.69	$ 6.13	$ 7.81
Buildings and improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Buildings and improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	40 years
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	7 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years
Investment tax credit
Government Assistance [Line Items]
Investment tax credit, asset, current, BS classification	Other Assets, Current	Other Assets, Current
Investment tax credit, asset, current	$ 6.2	$ 10.2
Investment tax credit, expense, decrease	$ 1.2	$ 0.2
Change in useful life
Change in Accounting Estimate [Line Items]
Increase in useful life	2 years
Decrease in depreciation expense	$ 75.4
Decrease in cost of goods sold	25.8
Decrease in research and development	9.8
Decrease in ending inventory	39.8
Increase in net income	$ 35.6
Increase in diluted EPS (in dollars per share)	$ 0.22