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Current and Deferred Income Tax Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Deferred Income Tax Assets And Liabilities
Income before income taxes	$ 66,996	$ 94,113	$ 98,134	$ 115,588
Current tax expense	24,112	31,218	33,034	40,027
Deferred tax expense	3,180	7,686	7,121	8,294
Total tax expense	$ 27,292	$ 38,904	$ 40,155	$ 48,321

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

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