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SUBSEQUENT EVENTS (Details) - $ / shares
12 Months Ended
Sep. 30, 2020
Jun. 29, 2020
Mar. 30, 2020
Sep. 30, 2019
Jun. 28, 2019
Mar. 29, 2019
Nov. 05, 2020
Subsequent Event [Line Items]              
Date dividends declared Aug. 03, 2020 May 04, 2020 Feb. 12, 2020 Aug. 07, 2019 May 06, 2019 Feb. 13, 2019  
Date dividends paid Sep. 30, 2020 Jun. 29, 2020 Mar. 30, 2020 Sep. 30, 2019 Jun. 28, 2019 Mar. 29, 2019  
Date of record Sep. 17, 2020 Jun. 15, 2020 Mar. 16, 2020 Sep. 17, 2019 Jun. 14, 2019 Mar. 15, 2019  
Subsequent event              
Subsequent Event [Line Items]              
Dividends declared per common share             $ 0.32
Dividends declared per preferred share             $ 365.625
Subsequent event | Common Stock              
Subsequent Event [Line Items]              
Date dividends declared             Nov. 05, 2020
Date dividends paid             Dec. 28, 2020
Date of record             Dec. 14, 2020
Subsequent event | Preferred Stock              
Subsequent Event [Line Items]              
Date dividends declared             Nov. 05, 2020
Date dividends paid             Dec. 15, 2020
Date of record             Nov. 30, 2020