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Notes Payable and Long-Term Debt - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
May 31, 2026
May 31, 2025
May 31, 2026
May 31, 2025
Aug. 31, 2025
Debt Instrument [Line Items]          
Total available under securitization facility $ 1,100,000   $ 1,100,000   $ 802,600
Interest expense 49,725 $ 44,109 130,833 $ 96,962  
Capitalized interest 4,600 $ 8,200 19,000 $ 22,800  
Committed          
Debt Instrument [Line Items]          
Maximum availability under securitization facility 850,000   850,000    
Uncommitted          
Debt Instrument [Line Items]          
Maximum availability under securitization facility 250,000   250,000    
Loan Amount Utilized          
Debt Instrument [Line Items]          
Total available under securitization facility 650,000   650,000   296,000
Repurchase Facility          
Debt Instrument [Line Items]          
Borrowings outstanding 250,000   250,000   159,700
Maximum borrowing capacity 250,000   250,000    
Term loan          
Debt Instrument [Line Items]          
Amount draw on revolving term loan facility     300,000    
Amounts outstanding 300,000   $ 300,000   0
Revolving credit facility | Five-Year Revolving Facilities | Line of Credit          
Debt Instrument [Line Items]          
Debt instrument term     5 years    
Committed amount provided 2,800,000   $ 2,800,000    
Borrowings outstanding $ 190,000   $ 190,000   $ 180,000