Supplemental Balance Sheet Information (Property, Plant And Equipment, net) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Oct. 01, 2023
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 17,693.2	$ 17,310.2
Accumulated depreciation	(10,081.5)	(9,923.1)
Property, plant and equipment, net	7,611.7	7,387.1
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	46.1	46.1
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	678.4	666.5
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	10,321.7	10,133.7
Store Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,432.6	3,332.5
Roasting Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	886.7	859.4
Furniture, Fixtures and Other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,717.4	1,664.5
Work in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 610.3	$ 607.5