Composition Of Certain Financial Statement Captions (Schedule Of Accrued Liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 28, 2018	Sep. 29, 2017
Composition Of Certain Financial Statement Captions [Abstract]
Document Period End Date	Sep. 28, 2018
Accrual for Unpaid, Property, Plant and Equipment Additions	$ 13,956	$ 10,096
Accrued royalties	2,430	2,274
Amounts payable to joint licensing program partners	53,942	49,141
Accrued compensation and benefits	84,491	92,277
Accrued professional fees	9,749	5,530
Other accrued liabilities	59,026	47,716
Accrued liabilities	$ 223,594	$ 207,034