Income Taxes (Schedule of Reconciliation of Income Taxes at Statutory Rate and Tax Provision) (Details) - USD ($) $ in Millions		3 Months Ended	9 Months Ended	12 Months Ended
		Dec. 31, 2013	Sep. 26, 2014	Sep. 30, 2016		Sep. 25, 2015		Sep. 26, 2014
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent				20.00%		20.00%		35.00%
Provision for income taxes at Domestic statutory income tax rate (1)	[1]			$ 46.6		$ 21.4		$ (12.1)
Current State and Local Tax Expense (Benefit)	[2]			0.0		0.0		(7.0)
Adjustments to reconcile to income tax provision:
Rate difference between non-U.S. and U.S. jurisdictions	[3],[4]			(249.3)		(152.9)		(14.2)
Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Amount	[2]			0.0		0.0		(2.7)
Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Amount						(4.3)
Valuation allowances, nonrecurring				2.1		(2.1)		0.1
Adjustments to accrued income tax liabilities and uncertain tax positions				(14.9)		(7.0)		(0.4)
Interest and penalties on accrued income tax liabilities and uncertain tax positions				(16.4)		0.3		(7.7)
Investment in partnership				0.0		0.0		20.0
Credits, principally research		$ (0.7)	$ (3.6)	(33.7)	[3],[5]	(8.1)	[3],[5]	(0.7)	[3],[5]
Permanently nondeductible and nontaxable items				7.9		14.7		13.4
Other				2.1		4.4		(1.3)
Tax Adjustments, Settlements, and Unusual Provisions				27.4
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount				15.1		34.9		4.4
Provision for (benefit from) income taxes	[6]			$ (255.6)		$ (129.3)		$ (12.6)

[1] The statutory tax rate reflects the U.K. statutory tax rate of 20% for fiscal 2016 and 2015, and the U.S. federal statutory tax rate of 35% for fiscal 2014.

[2] For fiscal 2016, U.S. state income tax benefit of $15.1 million was combined with the rate differences between Domestic and International jurisdictions. For fiscal 2015, U.S. state income tax benefit of $34.9 million, and U.S. manufacturing deduction tax benefit of $4.3 million were combined with the rate differences between Domestic and International jurisdictions. Fiscal 2014 includes U.S. state income tax benefit of $4.4 million associated with fiscal 2014 acquisitions and integration thereof.

[3] Due to the December 31, 2013 Research Credit tax law expiration, fiscal 2014 includes $0.7 million for the period September 28, 2013 through December 31, 2013. During fiscal 2015, the legislation was extended, with a retroactive effective date of January 1, 2014. As such, fiscal 2015 includes approximately $3.6 million of credit related to the period January 1, 2014 through September 26, 2014.

[4] Includes the impact of certain recurring valuation allowances for Domestic and International jurisdictions.

[5] The Company realized a tax benefit of $27.4 million resulting from a U.K. tax credit on a dividend between affiliates.

[6] Domestic reflects U.K. in fiscal 2016 and 2015, and U.S. federal and state in fiscal 2014.