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Net Income Per Share - Basic and Diluted Net Income Per Share (Detail) - shares | 3 Months Ended | 9 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Earnings Per Share [Abstract] |  |  |  |
Weighted average common shares outstanding used in calculating basic income per share | 22,243,895 | 22,399,079 | 22,619,802 | 22,185,736
Effect of dilutive options and non-vested restricted stock awards | 577,307 | 783,467 | 593,181 | 758,845
Weighted average common and common equivalent shares used in calculating diluted income per share | 22,821,202 | 23,182,546 | 23,212,983 | 22,944,581

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