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Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Valuation allowance on deferred tax assets	$ 164,000		$ 164,000		$ 164,000
Income tax provision	$ 1,638,000	$ 1,890,000	$ 4,867,000	$ 3,450,000
Effective income tax rate	24.40%	26.30%	25.60%	25.30%

X

- Definition

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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- Definition

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

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

+ References

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