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Income Taxes - Schedule of Components of Deferred Income Tax Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016
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Current deferred income taxes: |  |
Gross assets | $ 3,978 | $ 4,384
Gross liabilities and valuation allowance | (439) | (378)
Net current deferred income tax asset | 3,539 | 4,006
Noncurrent deferred income taxes: |  |
Gross assets | 18,559 | 16,170
Gross liabilities and valuation allowance | (18,330) | (16,308)
Net noncurrent deferred income tax asset (liability) | 229 | (138)
Net deferred income tax asset | $ 3,768 | $ 3,868

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