Supplemental Balance Sheet Information (Property, Plant And Equipment, net) (Details) - USD ($) $ in Millions	Dec. 27, 2015	Sep. 27, 2015
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 9,788.3	$ 9,641.8
Accumulated depreciation	(5,665.8)	(5,553.5)
Property, plant and equipment, net	4,122.5	4,088.3
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	46.6	46.6
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	415.1	411.5
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	5,471.5	5,409.6
Store Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,763.6	1,707.5
Roasting Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	548.3	542.4
Furniture, Fixtures and Other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,275.0	1,281.7
Work in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 268.2	$ 242.5