Composition Of Certain Financial Statement Captions (Schedule Of Accrued Liabilities) (Details) - USD ($) $ in Thousands	Mar. 30, 2018	Sep. 29, 2017
Composition Of Certain Financial Statement Captions [Abstract]
Accrued royalties	$ 2,308	$ 2,274
Amounts payable to patent administration program partners	45,940	49,141
Accrued compensation and benefits	63,973	92,277
Accrued professional fees	8,347	5,530
Capital expenditures incurred, but not yet paid	9,809	10,096
Other accrued liabilities	37,416	47,716
Total	$ 167,793	$ 207,034