Supplemental Balance Sheet Information (Property, Plant And Equipment, net) (Details) - USD ($) $ in Millions	Mar. 30, 2025	Sep. 29, 2024
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 19,872.4	$ 19,441.0
Accumulated depreciation	(11,052.2)	(10,775.5)
Property, plant and equipment, net	8,820.2	8,665.5
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	56.9	56.9
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	672.8	684.8
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	11,680.6	11,453.9
Store Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,910.6	3,803.6
Roasting Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	869.6	865.7
Software and Software Development Costs
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,123.2	1,049.7
Furniture, Fixtures and Other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	765.8	775.5
Work in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 792.9	$ 750.9