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Composition Of Certain Financial Statement Captions (Tables)
 9 Months Ended
Jun. 25, 2021
Composition Of Certain Financial Statement Captions [Abstract]  
Schedule Of Accounts Receivable Accounts Receivable and Contract Assets
June 25,
2021		September 25,
2020
Trade accounts receivable$188,221 $147,618 
Accounts receivable from patent administration program licensees98,052 48,630 
Contract assets166,771 161,357 
Accounts receivable, gross and contract assets, gross453,044 357,605 
Less: allowance for credit losses(11,380)(15,908)
Total$441,664 $341,697 
Schedule Of Allowance For Credit Losses
Allowance for Credit LossesBeginning BalanceCharges/(Credits) 
to G&A		DeductionsEnding Balance
For fiscal year-to-date period ended:
September 25, 2020$9,775 $7,689 $(1,556)$15,908 
June 25, 202115,908 (567)(3,961)11,380 
Schedule Of Inventories Inventories
June 25,
2021		September 25,
2020
Raw materials$2,340 $3,770 
Work in process3,927 9,214 
Finished goods5,876 12,566 
Total$12,143 $25,550 
Schedule Of Prepaid Expenses And Other Current Assets Prepaid Expenses And Other Current Assets
June 25,
2021		September 25,
2020
Prepaid expenses$18,938 $17,884 
Other current assets24,602 35,138 
Total$43,540 $53,022 
Schedule Of Accrued Liabilities Accrued Liabilities
June 25,
2021		September 25,
2020
Amounts payable to patent administration program partners$83,910 $60,427 
Accrued compensation and benefits106,393 89,684 
Accrued professional fees10,873 10,344 
Unpaid property, plant, and equipment additions16,314 15,102 
Accrued customer refunds1,822 10,053 
Accrued market development funds12,302 6,612 
Other accrued liabilities23,419 27,752 
Total$255,033 $219,974 
Schedule Of Other Non-Current Liabilities Other Non-Current Liabilities
June 25,
2021		September 25,
2020
Supplemental retirement plan obligations$4,649 $4,181 
Non-current tax liabilities (1)
85,767 85,943 
Other liabilities24,832 32,030 
Total$115,248 $122,154