Supplemental Balance Sheet Information (Property, Plant And Equipment, net) (Details) - USD ($) $ in Millions	Dec. 29, 2024	Sep. 29, 2024
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 19,452.0	$ 19,441.0
Accumulated depreciation	(10,768.5)	(10,775.5)
Property, plant and equipment, net	8,683.5	8,665.5
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	56.8	56.9
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	667.8	684.8
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	11,467.4	11,453.9
Store Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,817.0	3,803.6
Roasting Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	862.1	865.7
Software and Software Development Costs
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,076.4	1,049.7
Furniture, Fixtures and Other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	748.4	775.5
Work in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 756.1	$ 750.9