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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
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