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Earnings per Share Narrative (Detail)
In Thousands, unless otherwise specified
 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Stock Options    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from computation of diluted earnings per share 6us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
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Restricted stock units    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from computation of diluted earnings per share 513us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
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