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Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016	Sep. 30, 2016
Income Taxes [Line Items]
Valuation allowance on deferred tax assets	$ 454,000		$ 454,000		$ 454,000
Income tax provision	$ 1,484,000	$ 1,497,000	$ 3,315,000	$ 2,245,000
Effective income tax rate	35.10%	37.60%	38.10%	41.40%
Accounting Standards Update 2016-09 [Member]
Income Taxes [Line Items]
Increase (decrease) in income tax expense		$ (67,000)		$ 134,000

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Income taxes.

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Increase decrease in income tax expense benefit.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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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