Supplemental Balance Sheet Information (Property, Plant and Equipment, net) (Details) - USD ($) $ in Millions	Oct. 03, 2021	Sep. 27, 2020
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 14,828.8	$ 14,155.3
Accumulated depreciation	(8,459.3)	(7,913.9)
Property, plant and equipment, net	6,369.5	6,241.4
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	46.2	46.0
Building [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	587.6	586.8
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	8,637.6	8,262.6
Store equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,934.1	2,800.3
Roasting equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	857.2	796.6
Furniture, fixtures and other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,392.0	1,285.7
Work in progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 374.1	$ 377.3