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Income Taxes - Schedule Of Tax Effects To Deferred Tax Assets And Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Sep. 30, 2024
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Income Tax Disclosure [Abstract] |  |
Net operating loss carry-forwards | $ 47,028 | $ 34,787
Capitalized research and development costs | 417,392 | 337,626
Accrued compensation and benefits | 14,444 | 13,493
Stock-based compensation | 9,933 | 8,606
Deferred revenue | 31,341 | 39,042
Lease liabilities | 56,282 | 53,945
Other accruals and reserves | 28,191 | 28,729
Tax credit carryforwards | 27,398 | 25,052
Depreciation | 1,759 | 1,507
Total deferred tax assets before deferred liabilities | 633,768 | 542,787
Valuation allowance | (34,281) | (39,651)
Deferred tax assets, net of valuation allowance | 599,487 | 503,136
Purchased intangibles | (59,096) | (53,047)
Depreciation | (32,269) | (29,441)
Deferred costs | (11,728) | (10,752)
Lease assets | (36,629) | (36,610)
Other accruals and reserves | (15,298) | (14,514)
Total deferred tax liabilities | (155,020) | (144,364)
Net deferred tax assets | $ 444,467 | $ 358,772

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