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Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2018
Income Taxes [Line Items]
Valuation allowance on deferred tax assets	$ 119,000		$ 119,000
Income tax provision	$ 1,560,000	$ 2,249,000
Effective income tax rate	24.10%	34.80%
Federal corporate tax rate	21.00%	35.00%
Tax Cuts and Jobs Act [Member]
Income Taxes [Line Items]
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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