Composition Of Certain Financial Statement Captions (Schedule Of Accrued Liabilities) (Details) - USD ($) $ in Thousands	9 Months Ended
	Jul. 01, 2016	Sep. 25, 2015
Composition Of Certain Financial Statement Captions [Abstract]
Document Period End Date	Jul. 01, 2016
Accrued royalties	$ 2,100	$ 1,951
Amounts payable to patent administration program partners	56,706	40,466
Accrued compensation and benefits	62,407	70,317
Accrued professional fees	6,169	6,523
Other accrued liabilities	47,191	50,050
Total	174,573	169,307
Capital expenditures incurred, but not yet paid	$ 9,100	$ 20,500