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Income Taxes - Provision for Income Tax Expense (Benefit) (Detail) - USD ($) | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Current: |  |  |
Federal | $ 2,381,000 | $ 679,000 | $ 261,000
State | 50,000 | 31,000 | 37,000
Total current | 2,431,000 | 710,000 | 298,000
Deferred: |  |  |
Federal | 1,238,000 | 1,768,000 | (1,871,000)
State | 91,000 | (121,000) | (154,000)
Total deferred | 1,329,000 | 1,647,000 | (2,025,000)
Income tax expense (benefit) | $ 3,760,000 | $ 2,357,000 | $ (1,727,000)

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