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Earning Per Share Data - Basic and Diluted Earnings Per Share (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Earnings Per Share [Abstract]        
Net income $ 3,415,000 $ 1,630,000 $ 4,809,000 $ 3,205,000
Common Shares:        
Weighted average common shares outstanding 14,390,000 14,320,000 14,384,000 14,314,000
Effect of dilutive stock options 207,000 169,000 210,000 146,000
Diluted shares outstanding 14,597,000 14,489,000 14,594,000 14,460,000
Basic:        
Net earnings per share [1] $ 0.24 $ 0.11 $ 0.33 $ 0.22
Diluted:        
Net earnings per share [1] $ 0.23 $ 0.11 $ 0.33 $ 0.22
[1] Prior year adjusted for three-for-two stock split