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Summary of Significant Accounting Policies - Effects of Early Adoption of New Accounting Pronouncement (Details) - USD ($) $ in Millions | Dec. 27, 2015 | Sep. 27, 2015
--- | --- | ---
New Accounting Pronouncement, Early Adoption [Line Items] |  |
Long-term deferred income tax assets | $ 938.5 | $ 1,180.8
New Accounting Pronouncement, Early Adoption, Effect [Member] |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |
Current deferred income tax assets |  | 0.0
Long-term deferred income tax assets |  | 1,180.8
Current deferred income tax liabilities (included in Accrued liabilities) |  | 0.0
Long-term deferred income tax liabilities (included in Other long-term liabilities) |  | 43.4
Net deferred tax asset |  | 1,137.4
As Filed [Member] | New Accounting Pronouncement, Early Adoption, Effect [Member] |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |
Current deferred income tax assets |  | 381.7
Long-term deferred income tax assets |  | 828.9
Current deferred income tax liabilities (included in Accrued liabilities) |  | 5.4
Long-term deferred income tax liabilities (included in Other long-term liabilities) |  | 67.8
Net deferred tax asset |  | 1,137.4
Reclass [Member] | New Accounting Pronouncement, Early Adoption, Effect [Member] |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |
Current deferred income tax assets |  | (381.7)
Long-term deferred income tax assets |  | 351.9
Current deferred income tax liabilities (included in Accrued liabilities) |  | (5.4)
Long-term deferred income tax liabilities (included in Other long-term liabilities) |  | (24.4)
Net deferred tax asset |  | $ 0.0

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