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Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended			9 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Sep. 30, 2017
Income Taxes [Line Items]
Valuation allowance on deferred tax assets	$ 299,000			$ 299,000		$ 246,000
Income tax provision	$ 6,723,000		$ 9,094,000	$ 10,582,000	$ 12,409,000
Effective income tax rate	27.90%		39.00%	27.60%	38.70%
Federal corporate tax rate		35.00%		21.00%
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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