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Earnings Per Share - Additional Information (Detail) - shares
shares in Thousands
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Earnings Per Share [Abstract]      
Weighted average number of shares attributable to antidilutive outstanding stock options not included in the calculation of diluted earnings per share 1,281 1,785 724