Notes Payable - Rental Textuals (Details) - USD ($)	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Debt Instrument [Line Items]
Letters of credit, amount outstanding	$ 242,900,000
Rental
Debt Instrument [Line Items]
Line of credit, current borrowing capacity	1,050,000,000.00
Line of credit, maximum borrowing capacity	2,000,000,000.0
Letter of Credit, Maximum Borrowing Capacity (in dollars)	$ 100,000,000
Letter of Credit, Maximum Borrowing Capacity	50.00%
Proceeds from Lines of Credit	$ 1,400,000,000
Repayments of Lines of Credit	1,100,000,000
Line of credit, amount outstanding	$ 745,000,000	$ 400,000,000.0
Line of Credit Facility, Interest Rate at Period End	6.90%
Letters of credit, amount outstanding	$ 0
Line of Credit Facility, Remaining Borrowing Capacity	$ 305,000,000