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Net Income Per Share - Basic and Diluted Net Income Per Share (Detail) - shares
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Earnings Per Share [Abstract]      
Weighted average common shares outstanding used in calculating basic net income per share 22,271,580 21,852,425 21,706,225
Effect of dilutive options and non-vested restricted stock awards 742,628 576,956 692,984
Weighted average common and common equivalent shares used in calculating diluted net income per share 23,014,208 22,429,381 22,399,209