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Net Income Per Share - Basic and Diluted Net Income Per Share (Detail) - shares
3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Earnings Per Share [Abstract]    
Weighted average common shares outstanding used in calculating basic net income per share 22,196,141 21,756,165
Effect of dilutive options and non-vested restricted stock awards 612,876 467,008
Weighted average common and common equivalent shares used in calculating diluted net income per share 22,809,017 22,223,173