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Notes Payable and Long-Term Debt - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 30, 2015 | Aug. 31, 2018 | May 31, 2018 | Feb. 28, 2018 | Nov. 30, 2017 | Aug. 31, 2017 | May 31, 2017 | Feb. 28, 2017 | Nov. 30, 2016 | Feb. 28, 2018 | Feb. 28, 2017 | May 31, 2018 | May 31, 2017 | Aug. 31, 2018 | Aug. 31, 2017 | Aug. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  | $ 18,984 | $ 49,340 | $ 40,176 | $ 40,702 | $ 53,828 | $ 39,201 | $ 39,945 | $ 38,265 | $ 80,878 | $ 78,210 | $ 130,218 | $ 117,411 | $ 149,202 | $ 171,239 | $ 113,704
Long-term Debt, Fair Value |  | 1,800,000 |  |  |  |  |  |  |  |  |  |  |  | 1,800,000 |  |
Notes payable |  | 2,272,196 | $ 2,868,506 | $ 3,071,639 | $ 2,480,264 | 1,985,163 | $ 3,321,808 | $ 3,867,438 | $ 3,227,564 | $ 3,071,639 | $ 3,867,438 | $ 2,868,506 | $ 3,321,808 | 2,272,196 | 1,985,163 |
Long-term Debt |  | $ 1,918,689 |  |  |  |  |  |  |  |  |  |  |  | 1,918,689 |  |
Capitalized Interest |  |  |  |  |  |  |  |  |  |  |  |  |  | (6,700) | (6,900) | $ (30,300)
Long-term debt repaid |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 208,000 |  |
Unsecured debt | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 1.30% |  |  |  |  |  |  |  |  |  |  |  | 1.30% |  |
Unsecured debt | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 15.25% |  |  |  |  |  |  |  |  |  |  |  | 15.25% |  |
Five-year revolving facilities | Line of credit | Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, amount outstanding |  | $ 0 |  |  |  | 480,000 |  |  |  |  |  |  |  | $ 0 | 480,000 |
Debt Instrument, Term |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |
Five-year revolving facilities | Line of credit | Revolving credit facility | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |
Five-year revolving facilities | Line of credit | Revolving credit facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.45% |  |
Three-year revolving facility | Line of credit | Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |
Uncommitted lines of credit | Line of credit | Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit, Noncurrent |  | 454,100 |  |  |  |  |  |  |  |  |  |  |  | $ 454,100 |  |
Other international subsidiaries, lines of credit | Line of credit | Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, amount outstanding |  | 279,400 |  |  |  |  |  |  |  |  |  |  |  | 279,400 |  |
Line Of Credit, Collateralized Amount |  | 40,500 |  |  |  |  |  |  |  |  |  |  |  | 40,500 |  |
Miscellaneous short-term notes payable | Line of credit | Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, amount outstanding |  | 7,400 |  |  |  |  |  |  |  |  |  |  |  | 7,400 |  |
Master participation agreements | Notes Payable, Other Payables [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term bank loans and notes payable current borrowing capacity |  | 36,000 |  |  |  |  |  |  |  |  |  |  |  | 36,000 |  |
Notes payable |  | $ 6,300 |  |  |  |  |  |  |  |  |  |  |  | $ 6,300 |  |
Master participation agreements | Notes Payable, Other Payables [Member] | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 2.22% |  |  |  |  |  |  |  |  |  |  |  | 2.22% |  |
Master participation agreements | Notes Payable, Other Payables [Member] | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 3.72% |  |  |  |  |  |  |  |  |  |  |  | 3.72% |  |
Term loans from cooperative and other banks | Line of credit | Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 5.59% |  |  |  |  |  |  |  |  |  |  |  | 5.59% |  |
Long-term Debt |  | $ 0 |  |  |  | 15,000 |  |  |  |  |  |  |  | $ 0 | 15,000 |
Private placement, payable in equal installments beginning in 2014 through 2018 | Unsecured debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 6.18% |  |  |  |  |  |  |  |  |  |  |  | 6.18% |  |
Debt Instrument, Face Amount |  | $ 400,000 |  |  |  |  |  |  |  |  |  |  |  | $ 400,000 |  |
Long-term Debt |  | $ 0 |  |  |  | 80,000 |  |  |  |  |  |  |  | $ 0 | 80,000 |
Private placement, payable in installments through 2018 | Unsecured debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 5.60% |  |  |  |  |  |  |  |  |  |  |  | 5.60% |  |
Debt Instrument, Face Amount |  | $ 60,000 |  |  |  |  |  |  |  |  |  |  |  | $ 60,000 |  |
Long-term Debt |  | 0 |  |  |  | 4,615 |  |  |  |  |  |  |  | 0 | 4,615 |
Private placement, payable in equal installments beginning in 2014 through 2018 | Unsecured debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  | $ 0 |  |  |  | 10,000 |  |  |  |  |  |  |  | $ 0 | 10,000 |
Private placement, payable in equal installments beginning in 2014 through 2018 | Notes Payable, Other Payables [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 5.78% |  |  |  |  |  |  |  |  |  |  |  | 5.78% |  |
Debt Instrument, Face Amount |  | $ 50,000 |  |  |  |  |  |  |  |  |  |  |  | $ 50,000 |  |
Private placement, payable in equal installments beginning in 2017 through 2021 | Unsecured debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  | $ 60,000 |  |  |  | 80,000 |  |  |  |  |  |  |  | $ 60,000 | 80,000 |
Private placement, payable in equal installments beginning in 2017 through 2021 | Notes Payable, Other Payables [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 4.00% |  |  |  |  |  |  |  |  |  |  |  | 4.00% |  |
Debt Instrument, Face Amount |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |
Other notes and contracts | Secured debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  | 32,607 |  |  |  | 62,652 |  |  |  |  |  |  |  | 32,607 | 62,652 |
Notes Payable, Other Payables [Member] | Notes Payable, Other Payables [Member] | Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable |  | 1,437,264 |  |  |  | $ 1,695,423 |  |  |  |  |  |  |  | 1,437,264 | $ 1,695,423 |
Recourse loan commitments | Notes Payable, Other Payables [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term bank loans and notes payable current borrowing capacity |  | 180,900 |  |  |  |  |  |  |  |  |  |  |  | 180,900 |  |
Notes payable |  | $ 98,300 |  |  |  |  |  |  |  |  |  |  |  | $ 98,300 |  |
Interest rate |  | 3.22% |  |  |  |  |  |  |  |  |  |  |  | 3.22% |  |
Short-Term Notes Payable, Surplus Funds Program [Member] | Notes Payable, Other Payables [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable |  | $ 69,300 |  |  |  |  |  |  |  |  |  |  |  | $ 69,300 |  |
Short-Term Notes Payable, Surplus Funds Program [Member] | Notes Payable, Other Payables [Member] | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 0.10% |  |  |  |  |  |  |  |  |  |  |  | 0.10% |  |
Short-Term Notes Payable, Surplus Funds Program [Member] | Notes Payable, Other Payables [Member] | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 1.40% |  |  |  |  |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  |  |  |  | $ 600,000 |  |
Long-term Debt |  | $ 236,000 |  |  |  |  |  |  |  |  |  |  |  | $ 236,000 |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1336-112600 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1314-112600 + Details
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