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Earnings Per Share - Additional Information (Detail)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
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 46us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 14us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 270us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 7us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount