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INCOME TAXES - ADDITIONAL INFORMATION (Detail) - USD ($)
 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Income Taxes [Line Items]    
Net change in total valuation allowance $ 10,100,000 $ 1,900,000
Investment credit carryforwards 3,171,000 44,000
Alternative minimum tax credit carryforwards $ 392,000 $ 279,000
Research and development credits expiry period beginning year 2027  
Research and development credit carryforwards $ 1,600,000  
Accrued interest or penalties 0  
Research and development credit    
Income Taxes [Line Items]    
Investment credit carryforwards 1,900,000  
Federal    
Income Taxes [Line Items]    
Net operating loss carryforwards $ 29,400,000  
Operating loss carryforwards, expiration start year 2032  
State    
Income Taxes [Line Items]    
Net operating loss carryforwards $ 29,400,000  
Net operating loss carryforwards will begin to expire 2028  
Federal and state    
Income Taxes [Line Items]    
Net operating loss carryforwards $ 21,100,000