Annual report pursuant to Section 13 and 15(d)

INVESTMENTS - Narrative (Details)

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INVESTMENTS - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]    
Trading securities cost (in excess of) or below market value $ 838 $ 785
Maximum ownership interests in various entities recorded under the cost method 20.00%  
Ownership interest recorded as cost method investment $ 11,747  
Proceeds from the sale of cost method investments 9,159  
Realized gain on disposition of cost method investment $ 3,771