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Income Taxes - Schedule Of Tax Effects To Deferred Tax Assets And Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Sep. 30, 2021
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Income Tax Disclosure [Abstract] |  |
Net operating loss carry-forwards | $ 42,849 | $ 41,252
Capitalized research and development costs | 158,206 | 95,259
Accrued compensation and benefits | 14,068 | 13,207
Stock-based compensation | 10,389 | 12,829
Deferred revenue | 32,244 | 30,115
Lease liabilities | 21,572 | 23,747
Other accruals and reserves | 18,797 | 18,450
Tax credit carryforwards | 28,858 | 34,187
Depreciation | 505 | 580
Total deferred tax assets before deferred liabilities | 327,488 | 269,626
Valuation allowance | (46,136) | (40,404)
Deferred tax assets, net of valuation allowance | 281,352 | 229,222
Purchased intangibles | (57,350) | (57,219)
Depreciation | (22,278) | (26,516)
Deferred Tax Liabilities, Deferred Expense, Other Capitalized Costs | (12,987) | (13,057)
Deferred Tax Liabilities, Deferred Expense, Reserves and Accruals | (8,153) | (6,651)
Total deferred tax liabilities | (100,768) | (103,443)
Net deferred tax assets | $ 180,584 | $ 125,779

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