Supplemental Balance Sheet Information (Property, Plant And Equipment, net) (Details) - USD ($) $ in Millions	Mar. 27, 2016	Sep. 27, 2015
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 10,090.7	$ 9,641.8
Accumulated depreciation	(5,843.8)	(5,553.5)
Property, plant and equipment, net	4,246.9	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	428.7	411.5
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	5,594.0	5,409.6
Store Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,834.3	1,707.5
Roasting Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	562.4	542.4
Furniture, Fixtures and Other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,311.7	1,281.7
Work in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 313.0	$ 242.5