Shareholders' Equity - Narrative (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 03, 2024
Class of Stock [Line Items]
Forward sales equity agreement, settlement in cash	$ 1,659,625
Net proceeds from equity issuances	379,490	$ 254,022
Shelf Registration Statement
Class of Stock [Line Items]
Debt and equity securities authorized for issuance			$ 8,000,000
Debt and equity securities authorized for issuance value remaining	$ 6,300,000
At-The-Market
Class of Stock [Line Items]
Value of shares authorized for issuance			$ 1,700,000
Forward sales equity agreement (in shares)	4,609,043
Forward sales equity agreement, settlement in cash	$ 658,200
Shares issued (in shares)	3,300,904
Net proceeds from equity issuances	$ 379,500
Equity available for issuance	$ 1,000,000