Supplemental Balance Sheet Information (Property, Plant And Equipment, net) (Details) - USD ($) $ in Millions	Jul. 01, 2018	Oct. 01, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 12,801.0	$ 11,584.0
Accumulated depreciation	(7,111.4)	(6,664.5)
Property, plant and equipment, net	5,689.6	4,919.5
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	46.8	46.9
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	549.7	481.7
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,103.5	6,401.0
Store Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,314.4	2,110.7
Roasting Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	629.9	619.8
Furniture, Fixtures and Other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,634.9	1,514.1
Work in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 521.8	$ 409.8