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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, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Deferred Income Tax Assets And Liabilities
Income before income taxes	$ 101,564	$ 82,783	$ 104,852	$ 111,453
Current tax expense (benefit)	37,958	(1,989)	39,547	(761)
Deferred tax (benefit) expense	(8,719)	29,778	(9,335)	38,490
Deferred tax (benefit) expense - impact of tax reform		216		(11,236)
Total deferred tax (benefit) expense	(8,719)	29,994	(9,335)	27,254
Total tax expense	$ 29,239	$ 28,005	$ 30,212	$ 26,493

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

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