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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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