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Income Taxes - Schedule Of Tax Effects To Deferred Tax Assets And Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Sep. 30, 2022
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Income Tax Disclosure [Abstract] |  |
Net operating loss carry-forwards | $ 40,201 | $ 42,849
Capitalized research and development costs | 267,744 | 158,206
Accrued compensation and benefits | 11,995 | 14,068
Stock-based compensation | 8,875 | 10,389
Deferred revenue | 42,544 | 32,244
Lease liabilities | 62,405 | 67,520
Other accruals and reserves | 22,723 | 18,797
Tax credit carryforwards | 23,883 | 28,858
Depreciation | 531 | 505
Total deferred tax assets before deferred liabilities | 480,901 | 373,436
Valuation allowance | (43,942) | (46,136)
Deferred tax assets, net of valuation allowance | 436,959 | 327,300
Purchased intangibles | (55,519) | (57,350)
Depreciation | (28,113) | (22,278)
Deferred costs | (11,031) | (12,987)
Lease assets | (41,709) | (45,948)
Other accruals and reserves | (9,916) | (8,153)
Total deferred tax liabilities | (146,288) | (146,716)
Net deferred tax assets | $ 290,671 | $ 180,584

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