Shareholders' Equity - Narrative (Details) - USD ($)	9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Mar. 23, 2022
Class of Stock [Line Items]
Net proceeds available	$ 700,895,000
Net proceeds from equity issuances	675,320,000	$ 460,678,000
Shelf Registration Statement
Class of Stock [Line Items]
Debt and equity securities authorized for issuance	5,000,000,000
Debt and equity securities authorized for issuance value remaining	2,200,000,000
At-The-Market
Class of Stock [Line Items]
Equity available for issuance	$ 663,000,000		$ 1,000,000,000
Forward sales equity agreement (in shares)	10,308,214
Net proceeds available	$ 1,100,000,000
Stock issued during period, new issues (in shares)	6,932,722
Net proceeds from equity issuances	$ 675,300,000