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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