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Summary of Significant Accounting Policies (Narrative) (Details) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Apr. 09, 2015 USD ($) $ / shares | Sep. 27, 2015 USD ($) $ / shares | Sep. 28, 2014 USD ($) $ / shares | Sep. 29, 2013 USD ($)
Accounting Policies [Abstract] |  |  |  |
Number of reportable operating segments |  | 4 |  |
Receivables, net of Allowance for Doubtful Accounts |  |  |  |
Allowance for doubtful accounts |  | $ 10.8 | $ 6.7 |
Inventories |  |  |  |
Inventory reserves |  | 33.8 | 31.2 |
Property, Plant and Equipment [Line Items] |  |  |  |
Net disposition charges on property, plant and equipment |  | (12.5) | (14.7) | $ (17.4)
Net impairment charges on property, plant and equipment |  | 25.8 | 19.0 | 12.7
Other Intangible Assets |  |  |  |
Other intangible asset impairment charges |  | 0.0 | 0.0 | 0.0
Revenue Recognition |  |  |  |
Breakage income |  | 39.3 | 38.3 | 33.0
Marketing & Advertising |  |  |  |
Marketing expenses |  | 351.5 | 315.5 | 306.8
Advertising expenses |  | 227.9 | 198.9 | $ 205.8
Asset Retirement Obligations |  |  |  |
Net ARO assets included in property, plant and equipment |  | 5.8 | 4.1 |
Net ARO liabilities included in other long-term liabilities |  | $ 60.1 | $ 28.4 |
Class of Stock [Line Items] |  |  |  |
Stock split conversion ratio | 2 |  |  |
Common stock, par value | $ / shares |  | $ 0.001 | $ 0.001 |
Equipment [Member] | Maximum [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Estimated useful life of property, plant and equipment, in years |  | 15 years |  |
Equipment [Member] | Minimum [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Estimated useful life of property, plant and equipment, in years |  | 2 years |  |
Buildings [Member] | Maximum [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Estimated useful life of property, plant and equipment, in years |  | 40 years |  |
Buildings [Member] | Minimum [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Estimated useful life of property, plant and equipment, in years |  | 30 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 |  |  |

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