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AVAILABLE-FOR-SALE-SECURITIES, MATURITIES (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Sep. 30, 2017
Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis $ 79,397  
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis 45,104  
Available-for-sale Securities, Amortized Cost Basis 124,501  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value 79,373  
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value 45,082  
Available-for-sale securities $ 124,455 $ 0