Composition Of Certain Financial Statement Captions (Schedule Of Accrued Liabilities) (Details) - USD ($) $ in Thousands	Jun. 29, 2018	Sep. 29, 2017
Composition Of Certain Financial Statement Captions [Abstract]
Accrued royalties	$ 2,764	$ 2,274
Amounts payable to patent administration program partners	49,926	49,141
Accrued compensation and benefits	74,157	92,277
Accrued professional fees	7,632	5,530
Capital expenditures incurred, but not yet paid	13,130	10,096
Other accrued liabilities	49,467	47,716
Total	$ 197,076	$ 207,034