Supplemental Balance Sheet Information (Property, Plant And Equipment, net) (Details) - USD ($) $ in Millions	Jun. 28, 2020	Sep. 29, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 14,564.9	$ 14,273.5
Accumulated depreciation	(8,269.3)	(7,841.8)
Property, plant and equipment, net	6,295.6	6,431.7
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	46.8	46.8
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	582.9	691.5
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	8,210.3	7,948.6
Store Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,765.9	2,659.5
Roasting Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	789.1	769.6
Furniture, Fixtures and Other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,771.0	1,799.0
Work in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 398.9	$ 358.5