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Investments & Fair Value Measurements - Investment Portfolio (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 29, 2023 | Dec. 30, 2022 | Sep. 29, 2023
Cash and cash equivalents: |  |  |
Cash | $ 656,812 |  | $ 745,364
Cash, Unrealized Gains | 4 |  |
Cash and cash equivalents | 656,816 |  | 745,364
Short-term investments: |  |  |
Total | 235,317 |  | 368,793
Long-term investments: |  |  |
Cost | 92,950 |  | 99,665
Unrealized Gains | 356 |  | 6
Unrealized Losses | 430 |  | 1,859
Total | 92,876 |  | 97,812
Investment at Cost | 891,417 |  | 985,182
Investment unrealized gain | 417 |  | 10
Investment unrealized loss | (1,319) |  | (2,868)
Cash Cash Equivalents And Investments Total | $ 890,515 |  | $ 982,324
Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration] | Prepaid expenses and other current assets |  |
Derivative Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration] |  |  | Other non-current assets
Equity Method Investments | $ 6,500 |  | $ 5,900
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration] |  |  | Accrued liabilities
Derivative Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] |  |  | Other non-current liabilities
Net income | 66,981 | $ 79,375 |
Equity Method Investment, Nonconsolidated Investee or Group of Investees |  |  |
Long-term investments: |  |  |
Net income | 3,300 | $ 0 |
Derivative Financial Instruments, Liabilities, Current |  |  |
Long-term investments: |  |  |
Derivative Financial Instruments, Unrealized Gain |  |  | $ 0
Derivative Financial Instruments, Unrealized Loss |  |  | (618)
Derivative Liability, Current |  |  | (618)
Derivative Financial Instruments, Liabilities, Noncurrent |  |  |
Long-term investments: |  |  |
Derivative Financial Instruments, Unrealized Gain |  |  | 0
Derivative Financial Instruments, Unrealized Loss |  |  | (24)
Derivative Liability, Noncurrent |  |  | (24)
Derivative Financial Instruments, Assets, Current |  |  |
Long-term investments: |  |  |
Derivative Asset, Current | 2,829 |  | 144
Derivative Financial Instruments, Unrealized Gain | 2,829 |  | 144
Derivative Financial Instruments, Unrealized Loss | 0 |  | 0
Derivative Financial Instruments, Assets, Noncurrent |  |  |
Long-term investments: |  |  |
Derivative Asset, Noncurrent |  |  | 2
Derivative Financial Instruments, Unrealized Gain |  |  | 2
Derivative Financial Instruments, Unrealized Loss |  |  | 0
Certificate of deposit |  |  |
Short-term investments: |  |  |
Cost |  |  | 530
Unrealized Gains |  |  | 0
Unrealized Losses |  |  | 0
Total |  |  | 530
US Government Agencies Short-term Debt Securities [Member] |  |  |
Short-term investments: |  |  |
Cost | 3,892 |  | 5,956
Unrealized Gains | 1 |  | 1
Unrealized Losses | 0 |  | (7)
Total | 3,893 |  | 5,950
Government bonds |  |  |
Short-term investments: |  |  |
Cost | 43,998 |  | 50,220
Unrealized Gains | 19 |  | 3
Unrealized Losses | (503) |  | (384)
Total | 43,514 |  | 49,839
Long-term investments: |  |  |
Cost | 31,168 |  | 33,227
Unrealized Gains | 82 |  | 0
Unrealized Losses | 194 |  | 1,046
Total | 31,056 |  | 32,181
Commercial paper |  |  |
Short-term investments: |  |  |
Cost | 9,513 |  | 5,843
Unrealized Gains | 5 |  | 0
Unrealized Losses | 0 |  | (3)
Total | 9,518 |  | 5,840
Corporate bonds |  |  |
Short-term investments: |  |  |
Cost | 68,503 |  | 61,803
Unrealized Gains | 30 |  | 0
Unrealized Losses | (276) |  | (431)
Total | 68,257 |  | 61,372
Long-term investments: |  |  |
Cost | 38,068 |  | 39,057
Unrealized Gains | 212 |  | 6
Unrealized Losses | 196 |  | 589
Total | 38,084 |  | 38,474
Municipal debt securities |  |  |
Short-term investments: |  |  |
Cost | 15,749 |  | 15,801
Unrealized Gains | 2 |  | 0
Unrealized Losses | (110) |  | (184)
Total | 15,641 |  | 15,617
Long-term investments: |  |  |
Cost | 11,792 |  | 16,137
Unrealized Gains | 62 |  | 0
Unrealized Losses | 40 |  | 224
Total | 11,814 |  | 15,913
Short-Term Investments |  |  |
Short-term investments: |  |  |
Cost | 141,655 |  | 140,153
Unrealized Gains | 57 |  | 4
Unrealized Losses | (889) |  | (1,009)
Total | 140,823 |  | 139,148
Other Long-term Investments |  |  |
Long-term investments: |  |  |
Cost | 11,922 |  | 11,244
Unrealized Gains | 0 |  | 0
Unrealized Losses | 0 |  | 0
Total | 11,922 |  | 11,244
Estimated Fair Value | 5,000 |  | 5,000
Level 1 |  |  |
Cash and cash equivalents: |  |  |
Estimated Fair Value | 656,816 |  | 743,850
Short-term investments: |  |  |
Estimated Fair Value | 40,904 |  | 46,246
Long-term investments: |  |  |
Estimated Fair Value | 31,056 |  | 32,181
Assets | 728,776 |  | 822,277
Derivative Liability, Current |  |  | 0
Derivative Liability, Noncurrent |  |  | 0
Level 1 | Derivative Financial Instruments, Assets, Current |  |  |
Long-term investments: |  |  |
Derivative Asset, Current | 0 |  | 0
Level 1 | Derivative Financial Instruments, Assets, Noncurrent |  |  |
Long-term investments: |  |  |
Derivative Asset, Noncurrent |  |  | 0
Level 1 | Certificate of deposit |  |  |
Short-term investments: |  |  |
Estimated Fair Value |  |  | 0
Level 1 | US Government Agencies Short-term Debt Securities [Member] |  |  |
Short-term investments: |  |  |
Estimated Fair Value | 0 |  | 0
Level 1 | Government bonds |  |  |
Short-term investments: |  |  |
Estimated Fair Value | 40,904 |  | 46,246
Long-term investments: |  |  |
Estimated Fair Value | 31,056 |  | 32,181
Level 1 | Commercial paper |  |  |
Short-term investments: |  |  |
Estimated Fair Value | 0 |  | 0
Level 1 | Corporate bonds |  |  |
Short-term investments: |  |  |
Estimated Fair Value | 0 |  | 0
Long-term investments: |  |  |
Estimated Fair Value | 0 |  | 0
Level 1 | Municipal debt securities |  |  |
Short-term investments: |  |  |
Estimated Fair Value | 0 |  | 0
Long-term investments: |  |  |
Estimated Fair Value | 0 |  | 0
Level 1 | Other Long-term Investments |  |  |
Long-term investments: |  |  |
Estimated Fair Value | 0 |  | 0
Level 1 | Investments Held In Supplemental Retirement Plan |  |  |
Long-term investments: |  |  |
Assets | 4,483 |  | 4,400
Financial liabilities carried at fair value | 4,483 |  | 4,400
Level 2 |  |  |
Cash and cash equivalents: |  |  |
Estimated Fair Value | 0 |  | 1,514
Short-term investments: |  |  |
Estimated Fair Value | 99,919 |  | 92,902
Long-term investments: |  |  |
Estimated Fair Value | 49,898 |  | 54,387
Assets | 149,817 |  | 148,803
Derivative Liability, Current |  |  | (618)
Derivative Liability, Noncurrent |  |  | (24)
Level 2 | Derivative Financial Instruments, Assets, Current |  |  |
Long-term investments: |  |  |
Derivative Asset, Current | 2,829 |  | 144
Level 2 | Derivative Financial Instruments, Assets, Noncurrent |  |  |
Long-term investments: |  |  |
Derivative Asset, Noncurrent |  |  | 2
Level 2 | Certificate of deposit |  |  |
Short-term investments: |  |  |
Estimated Fair Value |  |  | 530
Level 2 | US Government Agencies Short-term Debt Securities [Member] |  |  |
Short-term investments: |  |  |
Estimated Fair Value | 3,893 |  | 5,950
Level 2 | Government bonds |  |  |
Short-term investments: |  |  |
Estimated Fair Value | 2,610 |  | 3,593
Long-term investments: |  |  |
Estimated Fair Value | 0 |  | 0
Level 2 | Commercial paper |  |  |
Short-term investments: |  |  |
Estimated Fair Value | 9,518 |  | 5,840
Level 2 | Corporate bonds |  |  |
Short-term investments: |  |  |
Estimated Fair Value | 68,257 |  | 61,372
Long-term investments: |  |  |
Estimated Fair Value | 38,084 |  | 38,474
Level 2 | Municipal debt securities |  |  |
Short-term investments: |  |  |
Estimated Fair Value | 15,641 |  | 15,617
Long-term investments: |  |  |
Estimated Fair Value | 11,814 |  | 15,913
Level 2 | Other Long-term Investments |  |  |
Long-term investments: |  |  |
Estimated Fair Value | 0 |  | 0
Level 2 | Investments Held In Supplemental Retirement Plan |  |  |
Long-term investments: |  |  |
Assets | 0 |  |
Financial liabilities carried at fair value | 0 |  |
Level 3 |  |  |
Cash and cash equivalents: |  |  |
Estimated Fair Value | 0 |  | 0
Short-term investments: |  |  |
Estimated Fair Value | 0 |  | 0
Long-term investments: |  |  |
Estimated Fair Value | 0 |  | 0
Assets | 0 |  | 0
Derivative Liability, Current |  |  | 0
Derivative Liability, Noncurrent |  |  | 0
Level 3 | Derivative Financial Instruments, Assets, Current |  |  |
Long-term investments: |  |  |
Derivative Asset, Current | 0 |  | 0
Level 3 | Derivative Financial Instruments, Assets, Noncurrent |  |  |
Long-term investments: |  |  |
Derivative Asset, Noncurrent |  |  | 0
Level 3 | Certificate of deposit |  |  |
Short-term investments: |  |  |
Estimated Fair Value |  |  | 0
Level 3 | US Government Agencies Short-term Debt Securities [Member] |  |  |
Short-term investments: |  |  |
Estimated Fair Value | 0 |  | 0
Level 3 | Government bonds |  |  |
Short-term investments: |  |  |
Estimated Fair Value | 0 |  | 0
Long-term investments: |  |  |
Estimated Fair Value | 0 |  | 0
Level 3 | Commercial paper |  |  |
Short-term investments: |  |  |
Estimated Fair Value | 0 |  | 0
Level 3 | Corporate bonds |  |  |
Short-term investments: |  |  |
Estimated Fair Value | 0 |  | 0
Long-term investments: |  |  |
Estimated Fair Value | 0 |  | 0
Level 3 | Municipal debt securities |  |  |
Short-term investments: |  |  |
Estimated Fair Value | 0 |  | 0
Long-term investments: |  |  |
Estimated Fair Value | 0 |  | 0
Level 3 | Other Long-term Investments |  |  |
Long-term investments: |  |  |
Estimated Fair Value | 0 |  | 0
Level 3 | Investments Held In Supplemental Retirement Plan |  |  |
Long-term investments: |  |  |
Assets | 0 |  |
Financial liabilities carried at fair value | 0 |  |
Cash |  |  |
Cash and cash equivalents: |  |  |
Cash | 643,276 |  | 602,288
Cash and cash equivalents | 643,276 |  | 602,288
Cash | Level 1 |  |  |
Cash and cash equivalents: |  |  |
Estimated Fair Value | 643,276 |  | 602,288
Cash | Level 2 |  |  |
Cash and cash equivalents: |  |  |
Estimated Fair Value | 0 |  | 0
Cash | Level 3 |  |  |
Cash and cash equivalents: |  |  |
Estimated Fair Value | 0 |  | 0
Government bonds |  |  |
Cash and cash equivalents: |  |  |
Cash |  |  | 1,731
Cash, Unrealized Gains | 4 |  |
Cash and cash equivalents | 9,979 |  | 1,731
Estimated Fair Value | 9,983 |  |
Government bonds | Level 1 |  |  |
Cash and cash equivalents: |  |  |
Estimated Fair Value | 9,983 |  | 1,731
Government bonds | Level 2 |  |  |
Cash and cash equivalents: |  |  |
Estimated Fair Value | 0 |  | 0
Government bonds | Level 3 |  |  |
Cash and cash equivalents: |  |  |
Estimated Fair Value |  |  | 0
Money market funds |  |  |
Cash and cash equivalents: |  |  |
Cash | 3,557 |  | 139,831
Cash and cash equivalents | 3,557 |  | 139,831
Money market funds | Level 1 |  |  |
Cash and cash equivalents: |  |  |
Estimated Fair Value | 3,557 |  | 139,831
Money market funds | Level 2 |  |  |
Cash and cash equivalents: |  |  |
Estimated Fair Value | 0 |  | 0
Money market funds | Level 3 |  |  |
Cash and cash equivalents: |  |  |
Estimated Fair Value | $ 0 |  | 0
Commercial paper |  |  |
Cash and cash equivalents: |  |  |
Estimated Fair Value |  |  | $ 1,514

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