Income Taxes (Aggregate Changes In Balance Of Gross Unrecognized Tax Benefits, Excluding Interest And Penalties) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2017	Sep. 30, 2016	Sep. 25, 2015	Sep. 26, 2014
Income Tax Disclosure [Abstract]
Unrecognized tax benefits if recognized, would affect our effective tax rate	$ 85,000
Estimated decrease in unrecognized tax benefits due to lapse in statute of limitations	3,700
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits, Beginning Balance	75,168	$ 65,161	$ 31,351
Increases in balances related to tax positions taken during prior years	308	4,343	507
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions	0	0		$ 0
Increases in balances related to tax positions taken during the current year	26,724	26,585	34,293
Settlements	(1,101)	(20,086)	0
Lapse of statute of limitations	(2,434)	(835)	(990)
Unrecognized Tax Benefits, Ending Balance	$ 98,665	$ 75,168	$ 65,161	$ 31,351