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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, 2021	Sep. 30, 2020	Sep. 30, 2019
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Abstract]
Income tax expense at federal statutory rate	$ 4,707	$ 7,769	$ 13,290
Increase (reduction) in income taxes resulting from:
State taxes, net of federal tax benefit	669	968	1,785
Nondeductible stock compensation expenses	(241)	524	(21)
Permanent items	292	314	261
Change in valuation allowances	(140)	1,173	(50)
162(m) limitation	12	14	119
Impact of changing rates on deferred tax assets	509	(2,313)	484
Expired tax attributes	152	633	111
Other	(132)	449	(273)
Provision for income taxes	$ 5,828	$ 9,531	$ 15,706

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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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