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Current and Deferred Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Deferred Income Tax Assets And Liabilities |  |
Income before income taxes | $ 3,288 | $ 28,670
Current tax expense | 1,589 | 1,228
Deferred tax (benefit) expense | (616) | 8,712
Deferred tax benefit - impact of tax reform |  | (11,452)
Total deferred tax benefit | (616) | (2,740)
Total tax expense (benefit) | $ 973 | $ (1,512)

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