Supplemental Balance Sheet Information (Property, Plant And Equipment, net) (Details) - USD ($) $ in Millions	Dec. 29, 2019	Sep. 29, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 14,424.0	$ 14,273.5
Accumulated depreciation	(8,033.1)	(7,841.8)
Property, plant and equipment, net	6,390.9	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	569.7	691.5
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	8,121.7	7,948.6
Store Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,722.8	2,659.5
Roasting Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	783.9	769.6
Furniture, Fixtures and Other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,818.8	1,799.0
Work in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 360.3	$ 358.5