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Net Income Per Share - Basic and Diluted Net Income Per Share (Detail) - shares	3 Months Ended								12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Weighted average common shares outstanding used in calculating basic income per share									22,294,114	22,269,378	23,966,611
Effect of dilutive options and non-vested restricted stock awards									587,033	761,284	712,189
Weighted average common and common equivalent shares used in calculating diluted income per share	21,896,257	22,821,202	23,417,688	23,400,685	23,286,206	23,182,546	22,940,594	22,712,648	22,881,147	23,030,662	24,678,800

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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.

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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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