Composition Of Certain Financial Statement Captions (Schedule Of Accrued Liabilities) (Details) - USD ($) $ in Thousands	Mar. 29, 2019	Sep. 28, 2018
Composition Of Certain Financial Statement Captions [Abstract]
Accrued royalties	$ 3,072	$ 2,648
Amounts payable to patent administration program partners	60,287	69,061
Accrued compensation and benefits	62,936	84,491
Accrued professional fees	12,516	9,749
Capital expenditures incurred, but not yet paid	10,010	13,956
Other accrued liabilities	81,887	63,223
Total	$ 230,708	$ 243,128