Shareholders' Equity - Narrative (Details) - USD ($)	6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Class of Stock [Line Items]
Net proceeds available	$ 673,218,000
Net proceeds from equity issuances	359,683,000	$ 594,320,000
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	4,000,000,000
At-The-Market
Class of Stock [Line Items]
Equity authorized	$ 1,000,000,000
Forward sales equity agreement (in shares)	2,177,143
Net proceeds available	$ 257,000,000
Stock issued during period, new issues (in shares)	3,394,919
Net proceeds from equity issuances	$ 359,700,000
Equity available for issuance	$ 1,000,000,000