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INVESTMENTS - Non-Current Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Non-current investments [Abstract]    
Equity and fixed income mutual funds $ 22,986 $ 22,758
Life insurance policies 4,030 5,894
Equity-method investments 39,761 0
Cost-method investments 18,724 16,778
Total non-current investments $ 85,501 $ 45,430