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Earnings Per Share - Additional Information (Detail)
3 Months Ended 6 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Mar. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Options to purchase shares of common stock excluded in the computation of diluted earnings per share because their inclusion would be antidilutive, shares 14,000 177,000 7,000 217,000