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Investments and Fair Value Measurements (Schedule Of Financial Assets Carried At Fair Value) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 26, 2025
Sep. 27, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash Equivalents, at Carrying Value $ 701,893 $ 482,047
Long-term investments, Total   89,267
Total cash, cash equivalents, and investments, cost 782,801 571,314
Total cash, cash equivalents, and investments, unrealized gains 0 0
Total cash, cash equivalents, and investments, unrealized losses 0 0
Total cash, cash equivalents, and investments, total 782,801 571,314
Assets 701,893 482,047
Equity Method Investments 68,500 84,300
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss, Current 703  
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax, Current 0  
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax, Current 0  
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Current 703  
Other long-term investments    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term investments, Cost 80,205 [1] 89,267 [2]
Long-term investments, Unrealized Gains 0 [1] 0 [2]
Long-term investments, Unrealized Losses 0 [1] 0 [2]
Long-term investments, Total 80,205 [1] 89,267 [2]
Short-term investments    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss, Current 703  
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax, Current 0  
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax, Current 0  
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Current 703  
Long-term investments    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term investments, Cost 80,205 89,267
Long-term investments, Unrealized Gains 0 0
Long-term investments, Unrealized Losses 0 0
Long-term investments, Total 80,205  
Cash    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash Equivalents, at Carrying Value 529,422 482,047
Cash 529,422 482,047
Money market funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash Equivalents, at Carrying Value 172,471  
Cash 172,471  
Total cash, cash equivalents, and investments, unrealized gains 0  
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash 701,893 482,047
Short-term investments 703  
Long-term investments 0 0
Assets 702,596 482,047
Level 1 | Other long-term investments    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term investments [2]   0
Level 1 | Short-term investments    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 703  
Level 1 | Investments held in supplemental retirement plan:    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Assets 5,413 5,044
Liabilities 5,413 5,044
Level 1 | Cash    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash 529,422 482,047
Level 1 | Money market funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash 172,471  
Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash 0 0
Short-term investments 0  
Long-term investments 0 0
Assets $ 0 0
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other non-current liabilities  
Derivative Liability $ (48)  
Level 2 | Short-term investments    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 0  
Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 0  
Long-term investments 0 76,000
Assets 0 76,000
Level 3 | Other long-term investments    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term investments 0 76,000
Level 3 | Short-term investments    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 0  
Derivative Financial Instruments, Liabilities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Currency derivatives as hedge instruments, liabilities, cost 0  
Currency derivatives as hedge instruments, unrealized gains 0  
Currency derivatives as hedge instruments, unrealized loss (48)  
Derivative Liability (48)  
Assets: Included in other current assets    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Currency derivatives as hedge instruments, assets, cost 0  
Currency derivatives as hedge instruments, unrealized gains 111  
Currency derivatives as hedge instruments, unrealized loss 0  
Derivative Asset 111  
Assets: Included in other current assets | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative Asset 111  
Derivative Financial Instruments, Assets, Current    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Currency derivatives as hedge instruments, assets, cost 0 0
Currency derivatives as hedge instruments, unrealized gains 1,442 299
Currency derivatives as hedge instruments, unrealized loss 0 0
Derivative Asset, Current $ 1,442 $ 299
Derivative Financial Instruments, Assets, Current | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration] Prepaid expenses and other current assets Prepaid expenses and other current assets
Derivative Asset, Current $ 1,442 $ 299
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