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Income Taxes - Schedule Of Tax Effects To Deferred Tax Assets And Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
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Income Tax Disclosure [Abstract] |  |
Net operating loss carry-forwards | $ 34,787 | $ 40,201
Capitalized research and development costs | 337,626 | 267,744
Accrued compensation and benefits | 13,493 | 11,995
Stock-based compensation | 8,606 | 8,875
Deferred revenue | 39,042 | 42,544
Lease liabilities | 53,945 | 62,405
Other accruals and reserves | 28,729 | 22,723
Tax credit carryforwards | 25,052 | 23,883
Depreciation | 1,507 | 531
Total deferred tax assets before deferred liabilities | 542,787 | 480,901
Valuation allowance | (39,651) | (43,942)
Deferred tax assets, net of valuation allowance | 503,136 | 436,959
Purchased intangibles | (53,047) | (55,519)
Depreciation | (29,441) | (28,113)
Deferred costs | (10,752) | (11,031)
Lease assets | (36,610) | (41,709)
Other accruals and reserves | (14,514) | (9,916)
Total deferred tax liabilities | (144,364) | (146,288)
Net deferred tax assets | $ 358,772 | $ 290,671

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