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Income taxes - Income tax provision (benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Current provision (benefit):
State	$ 156	$ (233)
Total	156	(233)
Deferred provision (benefit):
Federal	8	369
State	77	(27)
Total	85	342
Provision for income taxes	$ 241	$ 109

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Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

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Amount of current state and local tax expense (benefit) attributable to income (loss) from continuing operations. Includes, but is not limited to, current regional, territorial, and provincial tax expense (benefit) for non-US (United States of America) jurisdiction.

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