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Income Taxes - Provision for Income Tax Expense (Benefit) (Detail) - USD ($)
 12 Months Ended
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)