Summary of Significant Accounting Policies (Narrative) (Details) $ / shares in Units, $ in Millions		12 Months Ended
	Apr. 09, 2015 USD ($) $ / shares	Oct. 02, 2016 USD ($) $ / shares	Sep. 27, 2015 USD ($) $ / shares	Sep. 28, 2014 USD ($)
Accounting Policies [Abstract]
Number of reportable operating segments		4
Derivative [Line Items]
Derivative liability, cash collateral		$ 19.5
Derivative asset, cash collateral			$ 2.6
Derivative contract, potential effects of netting, reduction in value		9.4	12.5
Derivative asset		24.7	93.0
Derivative liability		80.2	21.2
Receivables, net of Allowance for Doubtful Accounts
Allowance for doubtful accounts		9.4	10.8
Inventories
Inventory reserves		39.6	33.8
Property, Plant and Equipment [Line Items]
Net disposition charges on property, plant and equipment		(25.1)	(12.5)	$ (14.7)
Net impairment charges on property, plant and equipment		24.1	25.8	19.0
Other Intangible Assets
Other intangible asset impairment charges		0.0	0.0	0.0
Revenue Recognition
Breakage income		60.5	39.3	38.3
Marketing & Advertising
Marketing expenses		378.7	351.5	315.5
Advertising expenses		248.6	227.9	$ 198.9
Asset Retirement Obligations
Net ARO assets included in property, plant and equipment		9.3	5.8
Net ARO liabilities included in other long-term liabilities		$ 67.9	$ 60.1
Class of Stock [Line Items]
Stock split conversion ratio
Common stock, par value | $ / shares		$ 0.001	$ 0.001
Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life of property, plant and equipment, in years		2 years
Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life of property, plant and equipment, in years		15 years
Buildings [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life of property, plant and equipment, in years		30 years
Buildings [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life of property, plant and equipment, in years		40 years
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life of property, plant and equipment, in years		10 years
Commodity Contract [Member] | Maximum [Member]
Derivative [Line Items]
Derivative instruments maturity, in years		3 years
Common Stock [Member]
Class of Stock [Line Items]
Stock split conversion ratio	2
Common stock, par value | $ / shares	$ 0.001
Impact to shareholders' equity from stock split	$ 0.0