Description of Business, Basis of Presentation, and Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				6 Months Ended
	Mar. 29, 2024	Dec. 29, 2023	Mar. 31, 2023	Dec. 30, 2022	Mar. 29, 2024	Mar. 31, 2023
Change in Accounting Estimate [Line Items]
Decrease in depreciation expense					$ 130.0	$ 198.4
Decrease in cost of goods sold	$ 625.7		$ 625.7		1,320.7	1,317.4
Decrease in research and development	154.4		148.2		307.3	312.0
Increase in net income	$ 183.3	$ 231.3	$ 232.8	$ 309.4	$ 414.6	$ 542.2
Increase in diluted EPS (in dollars per share)	$ 1.14		$ 1.46		$ 2.57	$ 3.39
Change in useful life
Change in Accounting Estimate [Line Items]
Increase in useful life	2 years				2 years
Decrease in depreciation expense	$ 18.9				$ 37.7
Decrease in cost of goods sold	1.8				1.8
Decrease in research and development	2.5				4.9
Decrease in ending inventory	31.0				31.0
Increase in net income	$ 4.3				$ 6.7
Increase in diluted EPS (in dollars per share)	$ 0.03				$ 0.04