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Net Income Per Share - Basic and Diluted Net Income Per Share (Detail) - shares	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Weighted average common shares outstanding used in calculating basic income per share	22,399,079	24,336,777	22,185,736	24,293,512
Effect of dilutive options and non-vested restricted stock awards	783,467	758,621	758,845	751,534
Weighted average common and common equivalent shares used in calculating diluted income per share	23,182,546	25,095,398	22,944,581	25,045,046

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 260
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