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Earnings Per Share - Additional Information (Detail)
3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Earnings Per Share [Abstract]    
Options to purchase shares of common stock excluded in the computation of diluted earnings per share because their inclusion would be antidilutive, shares 493,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount