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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - AVAILABLE FOR SALE SECURITIES (Details) - USD ($)
shares in Thousands, $ in Thousands
1 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2015
Mar. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Debt Securities, Available-for-sale [Line Items]          
Proceeds from sale of available for sale securities, net     $ 6,616 $ 6,639 $ 0
Gain on sale of available-for-sale securities, pre-tax     5,300 5,400  
Gain on sale of available-for-sale securities, net of tax     3,200 3,200  
Impairment of available for sale securities   $ 17,800      
Other than temporary impairment, net of tax   $ 14,800      
Available for sale securities     32,917 65,752  
Unrealized gain     4,700 12,800  
Unrealized gain, net of tax     3,400 $ 7,700  
Deferred gain, unamortized balance     $ (6,800)    
Common Units [Member]          
Debt Securities, Available-for-sale [Line Items]          
Ownership interest exchanged (in shares) 1,840        
Deferred gain $ 24,600