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Composition Of Certain Financial Statement Captions (Schedule Of Accrued Liabilities) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Apr. 01, 2016
Sep. 25, 2015
Composition Of Certain Financial Statement Captions [Abstract]    
Document Period End Date Apr. 01, 2016  
Accrued royalties $ 2,156 $ 1,951
Amounts payable to patent administration program partners 55,676 40,466
Accrued compensation and benefits 51,229 70,317
Accrued professional fees 4,274 6,523
Other accrued liabilities 45,199 50,050
Total 158,534 169,307
Capital expenditures incurred, but not yet paid $ 13,200 $ 20,500