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Equity Additional (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 02, 2019 | Mar. 11, 2019 | Aug. 31, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Sep. 30, 2019 | Feb. 01, 2019 | Jan. 19, 2018
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends, Common Stock |  |  |  | $ 26,368 | $ 26,875 | $ 30,652 | $ 53,715 |  |  |
Stock Issued During Period, Shares, Dividend Reinvestment Plan |  |  |  |  |  |  |  | 7,000,000 |  |
Common Stock, Dividends, Per Share, Declared |  | $ 0.035 |  | $ 0.035 |  | $ 0.07 |  |  |  |
Stock Repurchased and Retired During Period, Value |  |  |  | $ 128,014 | $ 0 | $ 149,868 | $ 0 |  |  |
Stock Repurchased and Retired During Period, Shares |  |  |  | 21,000,000 |  | 24,000,000 |  |  |  |
Shares Issued, Price Per Share |  |  |  |  |  |  |  |  |  | $ 14.00
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  |  |  |  |  |  | 18,750,000 |
IPO [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Sale of Stock, Number of Shares Issued in Transaction |  |  |  |  |  |  | 105,000,000 |  |  |
Sale of Stock, Consideration Received on Transaction |  |  |  |  |  |  | $ 1,400,000 |  |  |
Dividend Declared [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends, Common Stock |  |  |  | $ 26,000 |  | $ 53,000 |  |  |  |
Dividend Settled in Stock [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends, Common Stock |  |  |  |  |  |  |  | $ 46,000 |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Dividend Reinvestment Plan | 4,000,000 |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  |  | $ 0.035 |  |  |  |  |  |  |
Subsequent Event [Member] | Dividend Settled in Stock [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends, Common Stock | $ 23,000 |  |  |  |  |  |  |  |  |

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