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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Earnings Per Share [Abstract]        
Weighted average common shares outstanding used in calculating basic net income per share 21,524,315 22,132,915 21,761,811 22,100,190
Effect of dilutive options and non-vested restricted stock awards 648,958 904,764 694,017 822,336
Weighted average common and common equivalent shares used in calculating diluted net income per share 22,173,273 23,037,679 22,455,828 22,922,526