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Notes Payable and Long-Term Debt - Narrative (Details) - USD ($)
12 Months Ended
Aug. 31, 2022
Aug. 31, 2021
Aug. 31, 2020
Aug. 30, 2022
Feb. 19, 2022
Feb. 19, 2021
Debt Instrument [Line Items]            
Interest expense $ 114,156,000 $ 104,565,000 $ 116,977,000      
Long-term Debt, Fair Value 1,800,000,000          
Notes payable 606,719,000 1,740,859,000        
Long-term Debt 1,913,333,000          
Capitalized Interest (6,100,000) (8,000,000) $ (10,900,000)      
Long-term debt repaid 31,100,000          
Principal Amount Outstanding of Loans Held-in-portfolio 875,900,000          
maximum availability under securitization   700,000,000.0   $ 850,000,000.0    
Loans and Leases Receivable, Loans in Process $ 0          
Unsecured debt | Minimum            
Debt Instrument [Line Items]            
Interest rate 4.00%          
Unsecured debt | Maximum            
Debt Instrument [Line Items]            
Interest rate 9.00%          
Five-year revolving facilities | Line of credit | Revolving credit facility            
Debt Instrument [Line Items]            
Line of credit facility, amount outstanding $ 0          
Debt Instrument, Term 5 years          
Line of Credit Facility, Current Borrowing Capacity $ 2,750,000,000          
Uncommitted lines of credit | Line of credit | Revolving credit facility            
Debt Instrument [Line Items]            
Long-term Line of Credit, Noncurrent 309,300,000          
Other international subsidiaries, lines of credit | Line of credit | Revolving credit facility            
Debt Instrument [Line Items]            
Line of credit facility, amount outstanding 148,600,000          
Repurchase Facility [Member] | Subordinated Debt [Member]            
Debt Instrument [Line Items]            
Line of Credit Facility, Maximum Borrowing Capacity 150,000,000          
Line of Credit Facility, Fair Value of Amount Outstanding 0          
Other notes and contracts | Secured debt            
Debt Instrument [Line Items]            
Long-term Debt 2,262,000 33,443,000        
Notes Payable, Other Payables [Member] | Notes Payable, Other Payables [Member] | Revolving credit facility            
Debt Instrument [Line Items]            
Notes payable 459,398,000 $ 864,147,000        
Recourse loan commitments | Notes Payable, Other Payables [Member]            
Debt Instrument [Line Items]            
Short-term bank loans and notes payable current borrowing capacity 100,000,000          
Notes payable 0          
Short-Term Notes Payable, Surplus Funds Program [Member] | Notes Payable, Other Payables [Member]            
Debt Instrument [Line Items]            
Notes payable 147,300,000          
Term loans, 430K payable in 2025 [Member] | Unsecured debt            
Debt Instrument [Line Items]            
Long-term Debt         $ 366,000,000 $ 366,000,000
Committed Member            
Debt Instrument [Line Items]            
maximum availability under securitization 850,000,000          
Uncommitted Member            
Debt Instrument [Line Items]            
maximum availability under securitization $ 250,000,000