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Notes Payable and Long-Term Debt - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2015 | Aug. 31, 2020 | Aug. 31, 2019 | Aug. 31, 2018 | Aug. 14, 2020 | Jun. 26, 2020 | Jun. 25, 2020 | Sep. 04, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest expense |  | $ 116,977 | $ 167,065 | $ 149,202 |  |  |  |
Long-term Debt, Fair Value |  | 1,900,000 |  |  |  |  |  |
Notes payable |  | 1,575,491 | 2,156,108 |  |  |  |  |
Long-term Debt |  | 1,750,947 |  |  |  |  |  |
Capitalized Interest |  | (10,900) | (9,400) | $ (6,700) |  |  |  |
Long-term debt repaid |  | 25,400 |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  | 2,750,000 |  |  |  |  |  |
Principal Amount Outstanding of Loans Held-in-portfolio |  | 423,000 |  |  |  |  |  |
maximum availability under securitization |  | 500,000 |  |  |  | $ 500,000 | $ 700,000 |
Notes Purchase Agreement |  |  |  |  | $ 375,000 |  |  |
increase to maximum availability under securitization |  | 600,000 |  |  |  |  |  |
Revolving credit facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  | $ 100,000 |  |  |  |  |  |
Unsecured debt | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate |  | 0.00% |  |  |  |  |  |
Unsecured debt | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate |  | 10.00% |  |  |  |  |  |
Five-year revolving facilities | Line of credit | Revolving credit facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, amount outstanding |  | $ 345,000 | 335,000 |  |  |  |  |
Debt Instrument, Term |  | 5 years |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  | $ 2,750,000 |  |  |  |  |  |
Five-year revolving facilities | Line of credit | Revolving credit facility | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.55% |  |  |  |  |  |
Uncommitted lines of credit | Line of credit | Revolving credit facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term Line of Credit, Noncurrent |  | $ 318,400 |  |  |  |  |  |
Other international subsidiaries, lines of credit | Line of credit | Revolving credit facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, amount outstanding |  | 69,700 |  |  |  |  |  |
Repurchase Facility [Member] | Subordinated Debt [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  | $ 150,000
Line of Credit Facility, Fair Value of Amount Outstanding |  | 150,000 | 150,000 |  |  |  |  |
Private placement, payable in equal installments beginning in 2017 through 2021 | Unsecured debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term Debt |  | $ 20,000 | 40,000 |  |  |  |  |
Private placement, payable in equal installments beginning in 2017 through 2021 | Notes Payable, Other Payables [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate |  | 4.00% |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 100,000 |  |  |  |  |  |
Other notes and contracts | Secured debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term Debt |  | 34,709 | 18,601 |  |  |  |  |
Notes Payable, Other Payables [Member] | Notes Payable, Other Payables [Member] | Revolving credit facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Notes payable |  | 763,215 | $ 1,330,550 |  |  |  |  |
Recourse loan commitments | Notes Payable, Other Payables [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Short-term bank loans and notes payable current borrowing capacity |  | 150,000 |  |  |  |  |  |
Notes payable |  | $ 133,300 |  |  |  |  |  |
Interest rate |  | 1.45% |  |  |  |  |  |
Short-Term Notes Payable, Surplus Funds Program [Member] | Notes Payable, Other Payables [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Notes payable |  | $ 134,900 |  |  |  |  |  |
Short-Term Notes Payable, Surplus Funds Program [Member] | Notes Payable, Other Payables [Member] | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate |  | 0.35% |  |  |  |  |  |
Short-Term Notes Payable, Surplus Funds Program [Member] | Notes Payable, Other Payables [Member] | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate |  | 1.40% |  |  |  |  |  |
Committed Term Loans, September 2015 [Member] | Secured debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Term | 10 years |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 600,000 |  |  |  |  |  |
Long-term Debt |  | $ 236,000 |  |  |  |  |  |

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