Net Income Per Share - Basic and Diluted Net Income Per Share (Detail) - shares |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Earnings Per Share [Abstract] | ||||
| Weighted average common shares outstanding used in calculating basic net income per share | 22,068,431 | 21,515,092 | 22,012,594 | 22,249,076 |
| Effect of dilutive options and non-vested restricted stock awards | 1,089,380 | 0 | 815,233 | 0 |
| Weighted average common and common equivalent shares used in calculating diluted net income per share | 23,157,811 | 21,515,092 | 22,827,827 | 22,249,076 |