Supplemental Balance Sheet Information (Property, Plant And Equipment, net) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Oct. 01, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 12,229.4	$ 11,584.0
Accumulated depreciation	(6,850.7)	(6,664.5)
Property, plant and equipment, net	5,378.7	4,919.5
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	46.9	46.9
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	487.2	481.7
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	6,844.0	6,401.0
Store Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,234.3	2,110.7
Roasting Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	622.0	619.8
Furniture, Fixtures and Other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,599.2	1,514.1
Work in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 395.8	$ 409.8