Composition Of Certain Financial Statement Captions (Schedule Of Accrued Liabilities) (Details) - USD ($) $ in Thousands	Jun. 28, 2019	Sep. 28, 2018
Composition Of Certain Financial Statement Captions [Abstract]
Accrued royalties	$ 2,973	$ 2,648
Amounts payable to patent administration program partners	52,024	69,061
Accrued compensation and benefits	73,014	84,491
Accrued professional fees	15,154	9,749
Capital expenditures incurred, but not yet paid	4,631	13,956
Other accrued liabilities	95,942	63,223
Total	$ 243,738	$ 243,128