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Current and Deferred Income Tax Expense (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Deferred Income Tax Assets And Liabilities    
Income before income taxes $ 26,913us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 32,843us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Current tax expense 11,129us-gaap_CurrentIncomeTaxExpenseBenefit 10,223us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred tax expense 230us-gaap_DeferredIncomeTaxExpenseBenefit 3,332us-gaap_DeferredIncomeTaxExpenseBenefit
Total tax expense $ 11,359us-gaap_IncomeTaxExpenseBenefit $ 13,555us-gaap_IncomeTaxExpenseBenefit