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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details)	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Statutory rate	21.00%	21.00%	21.00%
State income taxes, net of federal benefit	3.00%	3.00%	3.00%
Research and development credit	(1.00%)	(1.00%)	(2.00%)
Foreign rate differential	1.00%	0.00%	0.00%
Valuation allowance	0.00%	0.00%	(3.00%)
Non-deductible expenses	2.00%	1.00%	1.00%
Impact of U.S. global intangible taxes and benefits	0.00%	1.00%	1.00%
Stock-based compensation	(3.00%)	(1.00%)	0.00%
Effective rate	23.00%	24.00%	21.00%

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Effective Income Tax Rate Reconciliation Change In Foreign and Domestic Valuation Allowance, Percent

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage of reported income tax expense from difference to expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to global intangible low-taxed income (GILTI).

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