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Investments & Fair Value Measurements - Investment Portfolio (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 30, 2022
Mar. 31, 2023
Sep. 30, 2022
Cash and cash equivalents:      
Cash   $ 688,443 $ 620,128
Cash and cash equivalents   688,443 620,127
Cash equivalents, unrealized Loss     1
Short-term investments:      
Total   308,063 426,149
Long-term investments:      
Cost   102,460 106,746
Unrealized Gains   269 4
Unrealized Losses   1,932 4,236
Total   100,797 102,514
Investment at Cost   918,629 917,841
Investment unrealized gain   285 13
Investment unrealized loss   (3,281) (6,000)
Cash Cash Equivalents And Investments Total   915,633 911,854
Equity Method Investments   $ 5,200 $ 5,900
Derivative Asset, Statement of Financial Position [Extensible Enumeration]   Prepaid expenses and other current assets  
Derivative Liability, Statement of Financial Position [Extensible Enumeration]   Accrued liabilities Accrued liabilities
Equity method investment income (loss)   $ 1,700  
Derivative Financial Instruments, Liabilities      
Long-term investments:      
Derivative Financial Instruments, Unrealized Gain   0  
Derivative Financial Instruments, Unrealized Loss $ (420) (299)  
Derivative Liability   (299) $ (420)
Derivative Financial Instruments, Liabilities, Amortized Cost Basis   0 0
us-Derivative Financial Instruments, Liabilities, Noncurrent      
Long-term investments:      
Derivative Financial Instruments, Unrealized Gain 0    
Derivative Financial Instruments, Assets      
Long-term investments:      
Derivative Financial Instruments, Assets, Amortized Cost Basis   0  
Derivative Financial Instruments, Unrealized Gain 0 641  
Derivative Financial Instruments, Unrealized Loss $ (4,882) 0  
Derivative Asset   641 (4,882)
Certificate of deposit      
Short-term investments:      
Cost   13,145 23,033
Unrealized Gains   2 8
Unrealized Losses   (41) (47)
Total   13,106 22,994
US Government Agencies Short-term Debt Securities [Member]      
Short-term investments:      
Cost   1,450 3,412
Unrealized Gains   0 0
Unrealized Losses   (31) (21)
Total   1,419 3,391
Government bonds      
Short-term investments:      
Cost   46,417 57,417
Unrealized Gains   1 0
Unrealized Losses   (879) (705)
Total   45,539 56,712
Long-term investments:      
Cost   33,745 43,816
Unrealized Gains   102 0
Unrealized Losses   828 2,222
Total   33,019 41,594
Commercial paper      
Short-term investments:      
Cost   6,892 8,786
Unrealized Gains   0 1
Unrealized Losses   (13) (15)
Total   6,879 8,772
Corporate bonds      
Short-term investments:      
Cost   35,796 72,730
Unrealized Gains   0 0
Unrealized Losses   (239) (734)
Total   35,557 71,996
Long-term investments:      
Cost   35,005 29,684
Unrealized Gains   40 4
Unrealized Losses   857 1,349
Total   34,188 28,339
Municipal debt securities      
Short-term investments:      
Cost   24,026 25,589
Unrealized Gains   13 0
Unrealized Losses   (146) (241)
Total   23,893 25,348
Long-term investments:      
Cost   23,489 21,483
Unrealized Gains   127 0
Unrealized Losses   247 626
Total   23,369 20,857
Short-Term Investments      
Short-term investments:      
Cost   127,726 190,967
Unrealized Gains   16 9
Unrealized Losses   (1,349) (1,763)
Total   126,393 189,213
Other Long-term Investments      
Long-term investments:      
Cost   10,221 10,902
Unrealized Gains   0 0
Unrealized Losses   0 0
Total   10,221 10,902
Estimated Fair Value   5,000 5,000
U.S. agency securities      
Long-term investments:      
Cost     861
Unrealized Gains     0
Unrealized Losses     39
Total     822
Level 1      
Cash and cash equivalents:      
Estimated Fair Value   688,443 609,800
Short-term investments:      
Estimated Fair Value   41,598 52,833
Long-term investments:      
Estimated Fair Value   32,132 38,055
Assets   762,173 700,688
Derivative Asset   0  
Derivative Liability   0  
Level 1 | Certificate of deposit      
Short-term investments:      
Estimated Fair Value   0 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   41,598 52,833
Long-term investments:      
Estimated Fair Value   32,132 38,055
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   4,000 4,225
Financial liabilities carried at fair value   4,000 4,225
Level 1 | U.S. agency securities      
Long-term investments:      
Estimated Fair Value     0
Level 2      
Cash and cash equivalents:      
Estimated Fair Value   0 10,327
Short-term investments:      
Estimated Fair Value   84,795 136,380
Long-term investments:      
Estimated Fair Value   58,444 53,557
Assets   143,239 200,264
Derivative Asset   641 (4,882)
Derivative Liability   (299) (420)
Level 2 | Certificate of deposit      
Short-term investments:      
Estimated Fair Value   13,106 22,994
Level 2 | US Government Agencies Short-term Debt Securities [Member]      
Short-term investments:      
Estimated Fair Value   1,419 3,391
Level 2 | Government bonds      
Short-term investments:      
Estimated Fair Value   3,941 3,879
Long-term investments:      
Estimated Fair Value   887 3,539
Level 2 | Commercial paper      
Short-term investments:      
Estimated Fair Value   6,879 8,772
Level 2 | Corporate bonds      
Short-term investments:      
Estimated Fair Value   35,557 71,996
Long-term investments:      
Estimated Fair Value   34,188 28,339
Level 2 | Municipal debt securities      
Short-term investments:      
Estimated Fair Value   23,893 25,348
Long-term investments:      
Estimated Fair Value   23,369 20,857
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 2 | U.S. agency securities      
Long-term investments:      
Estimated Fair Value     822
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 Asset   0  
Derivative Liability   0  
Level 3 | Certificate of deposit      
Short-term investments:      
Estimated Fair Value   0 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  
Level 3 | U.S. agency securities      
Long-term investments:      
Estimated Fair Value     0
Cash      
Cash and cash equivalents:      
Cash   597,659 474,813
Cash and cash equivalents   597,659 474,813
Cash | Level 1      
Cash and cash equivalents:      
Estimated Fair Value   597,659 474,813
Cash | Level 2      
Cash and cash equivalents:      
Estimated Fair Value   0 0
Cash | Level 3      
Cash and cash equivalents:      
Estimated Fair Value   0 0
Money Market Funds      
Cash and cash equivalents:      
Cash   90,784 134,987
Cash and cash equivalents   90,784 134,987
Money Market Funds | Level 1      
Cash and cash equivalents:      
Estimated Fair Value   90,784 134,987
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
U.S. agency securities      
Cash and cash equivalents:      
Cash     10,328
Cash and cash equivalents     10,327
Cash equivalents, unrealized Loss     1
U.S. agency securities | Level 1      
Cash and cash equivalents:      
Estimated Fair Value     0
U.S. agency securities | Level 2      
Cash and cash equivalents:      
Estimated Fair Value     10,327
U.S. agency securities | Level 3      
Cash and cash equivalents:      
Estimated Fair Value     $ 0