Supplemental Balance Sheet Information (Property, Plant And Equipment, net) (Details) - USD ($) $ in Millions	Dec. 27, 2020	Sep. 27, 2020
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 14,108.4	$ 14,155.3
Accumulated depreciation	(7,930.5)	(7,913.9)
Property, plant and equipment, net	6,177.9	6,241.4
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	46.2	46.0
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	597.4	586.8
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	8,231.7	8,262.6
Store Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,817.0	2,800.3
Roasting Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	805.6	796.6
Furniture, Fixtures and Other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,274.7	1,285.7
Work in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 335.8	$ 377.3

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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