Income Taxes (Aggregate Changes In Balance Of Gross Unrecognized Tax Benefits, Excluding Interest And Penalties) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 28, 2018	Sep. 29, 2017	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Document Period End Date	Sep. 28, 2018
Unrecognized tax benefits if recognized, would affect our effective tax rate	$ 96,900
Estimated decrease in unrecognized tax benefits due to lapse in statute of limitations	1,900
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits, Beginning Balance	98,665	$ 75,168	$ 65,161
Increases in balances related to tax positions taken during prior years	0	308	4,343
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions	(2,209)	0	0
Increases in balances related to tax positions taken during the current year	9,580	26,724	26,585
Settlements	(130)	(1,101)	(20,086)
Lapse of statute of limitations	(3,897)	(2,434)	(835)
Unrecognized Tax Benefits, Ending Balance	$ 102,009	$ 98,665	$ 75,168