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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, 2020	Sep. 30, 2019	Sep. 30, 2018
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Abstract]
Income tax expense at federal statutory rate	$ 7,769	$ 13,290	$ 3,878
Increase (reduction) in income taxes resulting from:
State taxes, net of federal tax benefit	968	1,785	660
Nondeductible stock compensation expenses	524	(21)
Permanent items	314	261	63
Change in valuation allowances	1,173	(50)	(646)
US Tax Cuts and Jobs Act Impact			(22,015)
162(m) Limitation	14	119
Impact of changing rates on deferred tax assets	(2,313)	484	(773)
Expired tax attributes	633	111	1,088
Other	449	(273)	319
Provision (Benefit) for income taxes	$ 9,531	$ 15,706	$ (17,426)

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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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