Summary of Significant Accounting Policies - Effects of Early Adoption of New Accounting Pronouncement (Details) - USD ($) $ in Millions	Jun. 26, 2016	Sep. 27, 2015
New Accounting Pronouncement, Early Adoption [Line Items]
Long-term deferred income tax assets	$ 822.8	$ 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