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INVESTMENTS - ADDITIONAL INFORMATION (Details) - USD ($)
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract]      
Other-than-temporary impairment charges recognized $ 0 $ 0 $ 0
Realized gains (losses) from sale of available-for-sale securities (49,000) 0 $ 0
Debt Securities, Available-for-sale [Line Items]      
Acquisition-related consideration, current 1,849,000 $ 0  
Other Current Liabilities | ICAR      
Debt Securities, Available-for-sale [Line Items]      
Acquisition-related consideration, current 1,800,000    
Other Noncurrent Liabilities | ICAR      
Debt Securities, Available-for-sale [Line Items]      
Acquisition-related consideration, noncurrent $ 1,200,000