Income Taxes (Aggregate Changes In Balance Of Gross Unrecognized Tax Benefits, Excluding Interest And Penalties) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 25, 2015	Sep. 26, 2014
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized tax benefits if recognized, would affect our effective tax rate	$ 62,100
Estimated decrease in unrecognized tax benefits due to lapse in statute of limitations	2,700
Unrecognized Tax Benefits, Expected Reduction as a Result of Settlement	1,100
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits, Beginning Balance	65,161	$ 31,351	$ 32,468
Increases in balances related to tax positions taken during prior years	4,343	507	333
Increases in balances related to tax positions taken during the current year	26,585	34,293	2,916
Lapse of statute of limitations	(835)	(990)	(4,366)
Settlements	(20,086)
Unrecognized Tax Benefits, Ending Balance	$ 75,168	$ 65,161	$ 31,351