Income Taxes (Tables)

12 Months Ended

Sep. 30, 2025

Income Tax Disclosure [Abstract]

Schedule of Components of Income (Loss) Before Income Tax Expense and Noncontrolling Interest

The components of the income (loss) before income tax expense and noncontrolling interest are as follows:

	Year Ended September 30,
	2025		2024		2023
	(in thousands)
Domestic	$	(42,573)	$	(582,333)	$	(194,639)
Foreign	94,106		(30,127)		(7,852)
Total	$	51,533	$	(612,460)	$	(202,491)

Schedule of Income Taxes for Provisions (Benefit)

Income tax provision (benefit) consisted of the following components:

	Year Ended September 30,
	2025		2024		2023
	(in thousands)
Current:
Federal	$	21,440	$	148	$	1,074
State	(56)		375		1,710
Foreign	35		(3,290)		—
Total current tax	$	21,419	$	(2,767)	$	2,784
Deferred:
Federal	$	—	$	—	$	—
State	—		—		—
Foreign	—		—		—
Total deferred tax	$	—	$	—	$	—
Income tax provision	$	21,419	$	(2,767)	$	2,784

Schedule of Effective Income Tax Rate Reconciliation

The following table presents a reconciliation of the tax expense based on the statutory rate to the Company’s actual tax expense in the consolidated statements of operations and comprehensive income (loss). A notional 21% tax rate was applied as follows:

	September 30,
	2025		2024		2023
U.S. federal statutory income tax	21.0	%	21.0	%	21.0	%
State income taxes, net of federal tax benefit	(3.1)	%	2.6	%	0.4	%
Tax credits	(44.4)	%	3.0	%	6.8	%
Permanent and other items	(37.9)	%	2.5	%	(4.6)	%
Non-deductible compensation	5.1	%	(0.9)	%	(4.6)	%
Foreign-derived intangible income deduction	(16.2)	%	—	%	1.2	%
Other income	11.1	%	—	%	—	%
Stock compensation	10.7	%	(0.7)	%	(1.1)	%
Valuation allowance	95.4	%	(27.0)	%	(20.5)	%
Effective income tax rate	41.7	%	0.5	%	(1.4)	%

Schedule of Components of the Net Deferred Tax Assets and Liabilities

The following table presents the significant components of the Company’s net deferred tax assets and liabilities:

	September 30,
	2025		2024
	(in thousands)
Deferred tax assets:
Net operating loss carryforwards	$	70,858	$	102,716
Capitalized research and development	232,360		156,015
Tax credits	48,867		85,428
Deferred revenue	171,262		81,556
Lease liabilities	23,919		27,999
Stock compensation	9,184		10,989
Accrued compensation	4,254		4,078
Intangible assets	1,034		1,384
Other	948		2,843
Total gross deferred tax assets	$	562,686	$	473,008
Valuation allowance	$	(497,543)	$	(448,867)
Deferred tax liabilities:
Fixed assets	$	(30,503)	$	(13,155)
Right-of-use assets	(9,424)		(10,792)
Unrealized gains	(630)		(194)
Original Issue Discount	(24,586)		—
Total gross deferred tax liability	$	(65,143)	$	(24,141)
Net deferred tax assets (liabilities)	$	—	$	—

Schedule of Gross Unrecognized Tax Benefits

The following table summarizes the Company’s gross unrecognized tax benefits:

	Year Ended September 30,
	2025		2024		2023
	(in thousands)
Beginning balance of unrecognized tax benefits	$	16,613	$	14,536	$	3,481
Gross increase for prior period tax positions	1,160		654		9,495
Gross decrease for prior period tax positions	—		—		(1,489)
Gross increase for current period tax positions	4,379		3,415		3,049
Lapse of statue of limitations	—		(1,992)		—
Ending balance of unrecognized tax benefits	$	22,152	$	16,613	$	14,536