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Earnings Per Share Data - Additional Information (Detail) - shares
3 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share [Abstract]    
Exercisable stock options, included in the diluted earnings per share calculation 325,000  
Effect of dilutive stock options 79,000 0
Anti-dilutive exercisable stock options, not included in the diluted earnings (loss) per share calculations 0 344,000