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Investments & Fair Value Measurements - Investment Portfolio (Details) - USD ($)
$ in Thousands
 6 Months Ended 9 Months Ended
Mar. 31, 2023
Jun. 30, 2023
Jul. 01, 2022
Sep. 30, 2022
Cash and cash equivalents:        
Cash   $ 765,078   $ 620,128
Cash, Unrealized Gains   1    
Cash and cash equivalents   765,079   620,127
Cash equivalents, unrealized Loss       1
Short-term investments:        
Total   284,788   426,149
Long-term investments:        
Cost   100,158   106,746
Unrealized Gains   34   4
Unrealized Losses   2,089   4,236
Total   98,103   102,514
Investment at Cost   990,636   917,841
Investment unrealized gain   40   13
Investment unrealized loss   (3,284)   (6,000)
Cash Cash Equivalents And Investments Total   987,392   911,854
Equity Method Investments   $ 3,900   $ 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)   $ 2,400 $ 3,500  
Derivative Financial Instruments, Liabilities        
Long-term investments:        
Derivative Financial Instruments, Unrealized Gain   0    
Derivative Financial Instruments, Unrealized Loss $ (420) (572)    
Derivative Liability   (572)   $ (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 0 597    
Derivative Financial Instruments, Unrealized Loss $ (4,882) 0    
Derivative Asset   597   (4,882)
Certificate of deposit        
Short-term investments:        
Cost   12,476   23,033
Unrealized Gains   1   8
Unrealized Losses   (12)   (47)
Total   12,465   22,994
US Government Agencies Short-term Debt Securities [Member]        
Short-term investments:        
Cost   5,891   3,412
Unrealized Gains   2   0
Unrealized Losses   (18)   (21)
Total   5,875   3,391
Government bonds        
Short-term investments:        
Cost   43,337   57,417
Unrealized Gains   1   0
Unrealized Losses   (624)   (705)
Total   42,714   56,712
Long-term investments:        
Cost   33,419   43,816
Unrealized Gains   0   0
Unrealized Losses   1,150   2,222
Total   32,269   41,594
Commercial paper        
Short-term investments:        
Cost   5,580   8,786
Unrealized Gains   0   1
Unrealized Losses   (4)   (15)
Total   5,576   8,772
Corporate bonds        
Short-term investments:        
Cost   37,386   72,730
Unrealized Gains   0   0
Unrealized Losses   (396)   (734)
Total   36,990   71,996
Long-term investments:        
Cost   35,929   29,684
Unrealized Gains   2   4
Unrealized Losses   707   1,349
Total   35,224   28,339
Municipal debt securities        
Short-term investments:        
Cost   20,730   25,589
Unrealized Gains   1   0
Unrealized Losses   (141)   (241)
Total   20,590   25,348
Long-term investments:        
Cost   21,633   21,483
Unrealized Gains   32   0
Unrealized Losses   232   626
Total   21,433   20,857
Short-Term Investments        
Short-term investments:        
Cost   125,400   190,967
Unrealized Gains   5   9
Unrealized Losses   (1,195)   (1,763)
Total   124,210   189,213
Other Long-term Investments        
Long-term investments:        
Cost   9,177   10,902
Unrealized Gains   0   0
Unrealized Losses   0   0
Total   9,177   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   765,079   609,800
Short-term investments:        
Estimated Fair Value   40,026   52,833
Long-term investments:        
Estimated Fair Value   31,390   38,055
Assets   836,495   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   40,026   52,833
Long-term investments:        
Estimated Fair Value   31,390   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   4,186   4,225
Financial liabilities carried at fair value   4,186   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   84,184   136,380
Long-term investments:        
Estimated Fair Value   57,536   53,557
Assets   141,720   200,264
Derivative Asset   597   (4,882)
Derivative Liability   (572)   (420)
Level 2 | Certificate of deposit        
Short-term investments:        
Estimated Fair Value   12,465   22,994
Level 2 | US Government Agencies Short-term Debt Securities [Member]        
Short-term investments:        
Estimated Fair Value   5,875   3,391
Level 2 | Government bonds        
Short-term investments:        
Estimated Fair Value   2,688   3,879
Long-term investments:        
Estimated Fair Value   879   3,539
Level 2 | Commercial paper        
Short-term investments:        
Estimated Fair Value   5,576   8,772
Level 2 | Corporate bonds        
Short-term investments:        
Estimated Fair Value   36,990   71,996
Long-term investments:        
Estimated Fair Value   35,224   28,339
Level 2 | Municipal debt securities        
Short-term investments:        
Estimated Fair Value   20,590   25,348
Long-term investments:        
Estimated Fair Value   21,433   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   693,427   474,813
Cash and cash equivalents   693,427   474,813
Cash | Level 1        
Cash and cash equivalents:        
Estimated Fair Value   693,427   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   71,651   134,987
Cash, Unrealized Gains   1    
Cash and cash equivalents   71,652   134,987
Money Market Funds | Level 1        
Cash and cash equivalents:        
Estimated Fair Value   71,652   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