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SUBSEQUENT EVENTS - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Feb. 05, 2020
Jan. 06, 2020
Nov. 06, 2019
Aug. 28, 2019
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2019
Subsequent Event [Line Items]                  
Dividends (in dollars per share)     $ 0.125 $ 0.125 $ 0.125 $ 0.125 $ 0.125 $ 0.125 $ 0.250
Subsequent event                  
Subsequent Event [Line Items]                  
Dividends (in dollars per share) $ 0.125                
Dividend reinvestment program, option to receive dividend, percentage in cash 50.00%                
Dividend reinvestment program, option to receive dividend, percentage in common stock 50.00%                
Subsequent event | King Kylie                  
Subsequent Event [Line Items]                  
Percentage of equity interests acquired   51.00%              
Base purchase price   $ 600.0