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Income Taxes - Schedule of Reconciliation between Effective Tax Rate Income from Continuing Operations and Statutory Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Abstract]
Income tax (benefit) provision at federal statutory rate	$ (49,280)	$ 4,707	$ 7,769
(Reduction) increase in income taxes resulting from:
State taxes, net of federal tax benefit	(3,953)	669	968
Nondeductible stock compensation expenses	251	(241)	524
Permanent items	206	292	314
Change in valuation allowances	(22)	(140)	1,173
162(m) limitation	11	12	14
Impact of changing rates on deferred tax assets	(247)	509	(2,313)
Expired tax attributes	964	152	633
Other	80	(132)	449
(Benefit) provision for income taxes	$ (51,990)	$ 5,828	$ 9,531

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

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Amount 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 attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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