Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Mar. 30, 2018	Dec. 29, 2017	Mar. 31, 2017	Mar. 30, 2018	Mar. 31, 2017
Federal statutory income tax rate	24.60%		35.00%	24.60%	35.00%
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount	$ 16.9	$ 257.8		$ 240.9
Tax Benefit To Recognize If Valuation Allowance Is Reversed	$ 6.3			$ 22.5
Cumulative Effect of New Accounting Principle in Period of Adoption		$ 18.5
Statutory Tax Rate Due to Change in Legislation				21.00%
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent	5.80%			2.50%
Accrued Income Taxes, Current	$ 21.4		$ 19.3	$ 21.4	$ 19.3
Deferred Tax Liability Not Recognized, Description of Temporary Difference, Undistributed Earnings of Foreign Subsidiaries				222.1
Years One through Five [Member]
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount				$ 19.3
Year Six [Member]
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount				36.1
Year Seven [Member]
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount				48.1
Year Eight [Member]
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount				$ 60.2