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Summary of Significant Accounting Policies Effects of Early Adoption of New Accounting Pronouncement (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 27, 2020	Sep. 29, 2019	Sep. 30, 2018	Sep. 30, 2019	Aug. 26, 2018
Amortization of Intangible Assets	$ 223.7	$ 232.8	$ 186.5
Deferred Revenue, Revenue Recognized	(176.8)	(175.2)
Deferred Revenue					$ 7,000.0
Deferred Tax Assets, Net, Noncurrent	1,789.9	1,765.8
Deferred Revenue, Current	1,456.5	1,269.0
Retained Earnings (Accumulated Deficit)	(7,815.6)	(5,771.2)
Deferred Revenue, Noncurrent	6,598.5	6,744.4
Deferred Tax and Other Liabilities, Noncurrent	907.3	1,370.5
Operating Lease, Right-of-Use Asset	8,134.1	0.0
Operating Lease, Liability, Noncurrent	$ 7,661.7	$ 0.0
Accounting Standards Update 2016-02 [Member]
Retained Earnings (Accumulated Deficit)				$ 17.3
Operating Lease, Right-of-Use Asset				8,400.0
Deferred Rent Credit				568.0
Operating Lease, Liability, Noncurrent				$ 9,000.0