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Earnings Per Share - Calculations of Net Income Per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Earnings Per Share And Equity [Abstract]      
Net income $ 16,588 $ 27,464 $ 47,580
Basic weighted average common shares outstanding 35,713 35,237 34,764
Add: Incremental shares for:      
Dilutive effect of warrants 2,543    
Dilutive effect of restricted stock 587 71 300
Diluted weighted average common shares outstanding 38,843 35,308 35,064
Net income per common share      
Basic $ 0.46 $ 0.78 $ 1.37
Diluted $ 0.43 $ 0.78 $ 1.36