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Composition Of Certain Financial Statement Captions (Tables)
 9 Months Ended
Jun. 26, 2020
Composition Of Certain Financial Statement Captions [Abstract]  
Schedule Of Accounts Receivable
Accounts Receivable
June 26,
2020		September 27,
2019
Trade accounts receivable$179,406  $151,996  
Accounts receivable from patent administration program licensees82,372  46,894  
Accounts receivable, gross261,778  198,890  
Less: allowance for doubtful accounts(14,292) (9,775) 
Total$247,486  $189,115  
Schedule Of Inventories
Inventories
June 26,
2020		September 27,
2019
Raw materials$5,827  $8,031  
Work in process8,192  4,872  
Finished goods15,311  19,428  
Total$29,330  $32,331  
Schedule Of Prepaid Expenses And Other Current Assets
Prepaid Expenses And Other Current Assets
June 26,
2020		September 27,
2019
Prepaid expenses$22,025  $17,997  
Other current assets23,353  20,924  
Income tax receivable146  783  
Total$45,524  $39,704  
Schedule Of Accrued Liabilities
Accrued Liabilities
June 26,
2020		September 27,
2019
Accrued royalties$822  $2,957  
Amounts payable to patent administration program partners59,290  58,899  
Accrued compensation and benefits80,173  78,716  
Accrued professional fees13,085  19,216  
Unpaid PP&E additions7,499  15,332  
Accrued customer refunds15,334  24,299  
Other accrued liabilities34,038  68,725  
Total$210,241  $268,144  
Schedule Of Other Non-Current Liabilities
Other Non-Current Liabilities
June 26,
2020		September 27,
2019
Supplemental retirement plan obligations$3,762  $3,466  
Non-current tax liabilities (1)
77,942  136,323  
Other liabilities38,286  37,673  
Total$119,990  $177,462