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Earnings Per Share - Computation of Diluted Earnings Per Share (Detail) - shares
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Earnings Per Share [Abstract]    
Weighted average common stock outstanding 5,067,055 5,887,396
Common stock equivalents - stock options and RSU's 78,255 73,293
Total diluted earning per shares 5,145,310 5,960,689