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Current and Deferred Income Tax Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Deferred Income Tax Assets And Liabilities
Income before income taxes	$ 129,876	$ 89,289	$ 156,789	$ 122,132
Current tax expense	46,642us-gaap_CurrentIncomeTaxExpenseBenefit	32,215us-gaap_CurrentIncomeTaxExpenseBenefit	57,772us-gaap_CurrentIncomeTaxExpenseBenefit	42,438us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred tax expense	7,547us-gaap_DeferredIncomeTaxExpenseBenefit	4,858us-gaap_DeferredIncomeTaxExpenseBenefit	7,776us-gaap_DeferredIncomeTaxExpenseBenefit	8,190us-gaap_DeferredIncomeTaxExpenseBenefit
Total tax expense	$ 54,189us-gaap_IncomeTaxExpenseBenefit	$ 37,073us-gaap_IncomeTaxExpenseBenefit	$ 65,548us-gaap_IncomeTaxExpenseBenefit	$ 50,628us-gaap_IncomeTaxExpenseBenefit

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.