Shareholders' Equity Narrative (Details) - USD ($)				9 Months Ended
	May 28, 2019	Nov. 30, 2018	Nov. 30, 2017	Jun. 30, 2019	Jun. 30, 2018	Nov. 19, 2018	Nov. 13, 2018
Class of Stock [Line Items]
Net proceeds from equity offering				$ 593,731,000	$ 395,092,000
Shelf Registration Statement
Class of Stock [Line Items]
Debt and equity securities authorized for issuance							$ 3,000,000,000.0
Debt and equity securities authorized for issuance value remaining				1,300,000,000
At-The-Market
Class of Stock [Line Items]
Value of shares authorized for issuance						$ 500,000,000
Value of shares available for issuance				$ 231,000,000
Common Stock Block Trade
Class of Stock [Line Items]
Stock Issued During Period, New Issues (in shares)	1,089,700	5,390,836	4,558,404
Gross proceeds from equity offering		$ 500,000,000	$ 400,000,000
Net proceeds from equity offering		$ 494,100,000	$ 395,100,000