Supplemental Balance Sheet Information (Property, Plant and Equipment, net) (Details) - USD ($) $ in Millions	Sep. 27, 2015	Sep. 28, 2014
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 9,641.8	$ 8,581.1
Accumulated depreciation	(5,553.5)	(5,062.1)
Property, plant and equipment, net	4,088.3	3,519.0
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	46.6	46.7
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	411.5	278.1
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	5,409.6	4,858.4
Store equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,707.5	1,493.3
Roasting equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	542.4	410.9
Furniture, fixtures and other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,281.7	1,078.1
Work in progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 242.5	$ 415.6