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Goodwill and Intangible Assets (Changes in Goodwill) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Oct. 01, 2021
Goodwill [Roll Forward]
Goodwill at beginning of the period	$ 2,176.7
Goodwill at end of the period	2,176.7	$ 2,176.7
Completed and transferred in-process research and development	$ 9.5	293.5
Weighted average amortization period (years)	12 years
Amortization of intangibles	$ 225.9	$ 288.4	$ 86.8

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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