Supplemental Balance Sheet Information (Property, Plant And Equipment, net) (Details) - USD ($) $ in Millions	Apr. 01, 2018	Oct. 01, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 12,541.6	$ 11,584.0
Accumulated depreciation	(6,964.8)	(6,664.5)
Property, plant and equipment, net	5,576.8	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	502.3	481.7
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	6,989.4	6,401.0
Store Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,276.5	2,110.7
Roasting Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	631.7	619.8
Furniture, Fixtures and Other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,604.5	1,514.1
Work in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 490.4	$ 409.8