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Investments and Fair Value Measurements (Schedule Of Financial Assets Carried At Fair Value) (Details) - USD ($) $ in Thousands | 12 Months Ended
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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 |
[1] |
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