Description of Business, Basis of Presentation, and Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended						9 Months Ended
	Jun. 28, 2024	Mar. 29, 2024	Dec. 29, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 30, 2022	Jun. 28, 2024	Jun. 30, 2023
Change in Accounting Estimate [Line Items]
Decrease in depreciation expense							$ 196.3	$ 295.8
Decrease in cost of goods sold	$ 541.4			$ 607.1			1,862.0	1,924.4
Decrease in research and development	160.7			148.0			468.1	460.0
Increase in net income	$ 120.9	$ 183.3	$ 231.3	$ 195.8	$ 232.8	$ 309.4	$ 535.5	$ 738.0
Increase in diluted EPS (in dollars per share)	$ 0.75			$ 1.22			$ 3.32	$ 4.61
Change in useful life
Change in Accounting Estimate [Line Items]
Increase in useful life	2 years						2 years
Decrease in depreciation expense	$ 18.9						$ 56.6
Decrease in cost of goods sold	8.9						10.7
Decrease in research and development	2.4						7.4
Decrease in ending inventory	38.5						38.5
Increase in net income	$ 11.3						$ 18.1
Increase in diluted EPS (in dollars per share)	$ 0.07						$ 0.11