Shareholders' Equity - Narrative (Details) - USD ($)	6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Class of Stock [Line Items]
Forward sales equity agreement, settlement in cash	$ 889,680,000
Net proceeds from equity issuances	254,022,000	$ 359,683,000
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	3,100,000,000
At-The-Market
Class of Stock [Line Items]
Value of shares authorized for issuance	$ 1,000,000,000
Forward sales equity agreement (in shares)	5,917,899
Forward sales equity agreement, settlement in cash	$ 678,900,000
Shares issued (in shares)	2,144,558
Net proceeds from equity issuances	$ 254,000,000
Equity available for issuance	$ 81,600,000