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Income Taxes - Current and Deferred Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Deferred Income Tax Assets And Liabilities
Income before income taxes	$ (33,153)	$ (11,421)	$ 71,699	$ 100,032
Current tax expense (benefit)	(8,184)	(5,803)	31,363	(6,564)
Deferred tax (benefit) expense	(1,871)	2,354	(11,206)	40,844
Deferred tax (benefit) expense - impact of tax reform		33		(11,203)
Total deferred tax (benefit) expense	(1,871)	2,387	(11,206)	29,641
Total tax expense (benefit)	$ (10,055)	$ (3,416)	$ 20,157	$ 23,077

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

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