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Income Taxes - Summary of Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Income Tax Disclosure [Abstract]
Unrecognized tax benefits at the beginning of the year	$ 4,085	$ 5,833
Increases in tax positions for prior years	0
Decreases in tax positions for prior years	(1,029)	(1,748)
Unrecognized tax benefits at the end of the year	$ 3,056	$ 4,085

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Amount of unrecognized tax benefits.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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