Supplemental Balance Sheet Information (Property, Plant and Equipment, net) (Details) - USD ($) $ in Millions	Oct. 01, 2017	Oct. 02, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 11,584.0	$ 10,573.3
Accumulated depreciation	(6,664.5)	(6,039.5)
Property, plant and equipment, net	4,919.5	4,533.8
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	46.9	46.6
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	481.7	458.4
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	6,401.0	5,892.9
Store equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,110.7	1,931.7
Roasting equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	619.8	605.4
Furniture, fixtures and other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,514.1	1,366.9
Work in progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 409.8	$ 271.4