Supplemental Balance Sheet Information (Property, Plant And Equipment, net) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Oct. 01, 2023
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 18,053.4	$ 17,310.2
Accumulated depreciation	(10,236.0)	(9,923.1)
Property, plant and equipment, net	7,817.4	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	671.8	666.5
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	10,532.8	10,133.7
Store Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,468.0	3,332.5
Roasting Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	880.1	859.4
Furniture, Fixtures and Other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,741.1	1,664.5
Work in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 713.5	$ 607.5