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Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2017
Income Taxes [Line Items]
Valuation allowance on deferred tax assets	$ 299,000		$ 246,000
Income tax provision	$ 2,249,000	$ 1,831,000
Effective income tax rate	34.80%	40.90%
Federal corporate tax rate	35.00%
Tax Cuts and Jobs Act [Member]
Income Taxes [Line Items]
Federal corporate tax rate	21.00%
Reduction in beginning deferred tax assets	$ 889,000
Increase in income tax provision	$ 889,000

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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

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