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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

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