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Stock Options and Awards (Detail) - Summary data of nonvested stock award activity - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Summary data of nonvested stock award activity [Abstract]      
Nonvested shares outstanding, number of nonvested shares 179,821 165,708  
Nonvested shares outstanding, weighted average grant date fair value (in Dollars per share) $ 8.64 $ 6.38  
Nonvested shares outstanding, weighted average remaining contractual term 2 years 40 days 2 years 84 days 2 years 2 months 13 days
Nonvested shares outstanding, aggregate intrinsic value (in Dollars) $ 1,987 $ 1,695  
Activity in 2017:      
Granted, number of nonvested shares 72,000 94,000  
Granted, weighted average grant date fair value (in Dollars per share) $ 11.83 $ 10.18  
Vested, number of nonvested shares (80,969) (71,587)  
Vested, weighted average grant date fair value (in Dollars per share) $ 8.18 $ 6.59  
Forfeited, number of nonvested shares (16,500) (8,300)  
Forfeited, weighted average grant date fair valuem (in Dollars per share) $ 8.90 $ 7.11  
Activity in 2018:      
Vested at September 30, 2018 331,833    
Vested at September 30, 2013 (in Dollars per share) $ 6.50    
Vested at September 30, 2018 88 days    
Vested at September 30, 2013 (in Dollars) $ 4,354    
Vested and expected to vest at September 30, 2018 486,185    
Vested and expected to vest at September 30, 2013 (in Dollars per share) $ 7.72    
Vested and expected to vest at September 30, 2018 304 days    
Vested and expected to vest at September 30, 2013 (in Dollars) $ 6,379    
Nonvested shares outstanding, number of nonvested shares 154,352 179,821 165,708
Nonvested shares outstanding, weighted average grant date fair value (in Dollars per share) $ 10.34 $ 8.64 $ 6.38
Nonvested shares outstanding, aggregate intrinsic value (in Dollars) $ 2,025 $ 1,987 $ 1,695