Supplemental Balance Sheet Information (Property, Plant And Equipment, net) (Details) (USD $) In Millions, unless otherwise specified	Mar. 29, 2015	Sep. 28, 2014
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 9,195.6us-gaap_PropertyPlantAndEquipmentGross	$ 8,581.1us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation	(5,297.9)	(5,062.1)
Property, plant and equipment, net	3,897.7us-gaap_PropertyPlantAndEquipmentNet	3,519.0us-gaap_PropertyPlantAndEquipmentNet
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	410.8	278.1
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	5,149.2	4,858.4
Store Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,588.2	1,493.3
Roasting Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	512.8	410.9
Furniture, Fixtures and Other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,180.4	1,078.1
Work in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 307.6	$ 415.6