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Net Income Per Share - Basic and Diluted Net Income Per Share (Detail) - shares	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Weighted average common shares outstanding used in calculating basic income per share	21,520,215	22,836,571	21,486,995	22,807,756
Effect of dilutive options and non-vested restricted stock awards	440,070	581,117	438,110	601,117
Weighted average common and common equivalent shares used in calculating diluted income per share	21,960,285	23,417,688	21,925,105	23,408,873

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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
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-Topic 260
-SubTopic 10
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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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