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Income Taxes - Current and Deferred Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Deferred Income Tax Assets And Liabilities
Income before income taxes	$ 83,108	$ 101,564	$ 122,645	$ 104,852
Current income tax expense	25,814	37,958	36,260	39,547
Deferred income tax expense (benefit)	(1,114)	(8,719)	222	(9,335)
Total income tax expense	$ 24,700	$ 29,239	$ 36,482	$ 30,212

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Deferred tax expense (benefit).

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- Definition

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

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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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