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Notes Payable - Rental Textuals (Details) - USD ($)
$ in Millions
 6 Months Ended
Mar. 31, 2025
Sep. 30, 2024
Debt Instrument [Line Items]    
Letters of Credit Outstanding, Amount $ 234.2  
Rental    
Debt Instrument [Line Items]    
Line of Credit Facility, Current Borrowing Capacity 1,050.0  
Line of Credit Facility, Maximum Borrowing Capacity 2,000.0  
Letter of Credit, Maximum Borrowing Capacity (in dollars) $ 100.0  
Letters of credit, sublimit borrowing capacity, as a percentage 50.00%  
Line of Credit Facility, Expiration Date Oct. 10, 2027  
Proceeds from Lines of Credit $ 790.0  
Repayments of Lines of Credit 485.0  
Borrowings outstanding on revolving credit facility $ 1,050.0 $ 745.0
Line of Credit Facility, Interest Rate at Period End 6.40%  
Letters of Credit Outstanding, Amount $ 0.0  
Line of Credit Facility, Remaining Borrowing Capacity $ 0.0