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Earnings Per Share Data - Additional Information (Detail) - shares
3 Months Ended 9 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Earnings Per Share [Abstract]        
Exercisable stock options, included in the diluted earnings per share calculation 331,000 342,000 325,000 343,000
Effect of dilutive stock options 139,000 66,000 111,000 67,000
Anti-dilutive exercisable stock options, not included in the diluted earnings per share calculation 0 0 0 0