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Composition Of Certain Financial Statement Captions (Schedule Of Accrued Liabilities) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jan. 01, 2016
Sep. 25, 2015
Composition Of Certain Financial Statement Captions [Abstract]    
Document Period End Date Jan. 01, 2016  
Accrued royalties $ 2,057 $ 1,951
Amounts payable to patent administration program partners 45,336 40,466
Accrued compensation and benefits 51,410 70,317
Accrued professional fees 5,003 6,523
Other accrued liabilities 55,829 50,050
Total 159,635 169,307
Capital expenditures incurred, but not yet paid $ 21,100 $ 20,500