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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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