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Current and Deferred Income Tax (Benefit) and Expenses (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Deferred Income Tax Assets And Liabilities |  |
Income before income taxes | $ 28,670 | $ 31,138
Current tax expense | 1,228 | 8,922
Deferred tax expense | 8,712 | 3,941
Deferred tax benefit - impact of tax reform | (11,452) |
Total deferred tax (benefit) expense | (2,740) | 3,941
Total tax (benefit) expense | $ (1,512) | $ 12,863

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