Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 29, 2017	Dec. 30, 2016	Sep. 29, 2017
Federal statutory income tax rate	24.60%	35.00%
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount	$ 257.8
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	18.5
Tax Benefit To Recognize If Valuation Allowance Is Reversed	$ 16.2
Statutory Tax Rate Due to Change in Legislation	21.00%
Accrued income taxes, current	$ 62.5		$ 32.2
Deferred Tax Liability Not Recognized, Description of Temporary Difference, Undistributed Earnings of Foreign Subsidiaries	237.2
Years One through Five [Member]
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount	$ 20.6
Year Six [Member]
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount	38.7
Year Seven [Member]
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount	51.6
Year Eight [Member]
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount	$ 64.5