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Notes Payable and Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2016 | Sep. 30, 2015 | Aug. 31, 2017 | Aug. 31, 2018 | May 31, 2018 | Feb. 28, 2018 | Nov. 30, 2017 | May 31, 2017 | Feb. 28, 2017 | Nov. 30, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Notes payable |  |  | $ 1,985,163 | $ 2,272,196 | $ 2,868,506 | $ 3,071,639 | $ 2,480,264 | $ 3,321,808 | $ 3,867,438 | $ 3,227,564
Total long-term debt |  |  |  | 1,918,689 |  |  |  |  |  |
Debt Issuance Costs, Net |  |  | (4,820) | (4,179) |  |  |  |  |  |
Capital Lease Obligations |  |  | 33,075 | 25,280 |  |  |  |  |  |
Long-term Debt, Fair Value |  |  | 2,179,793 | 1,930,255 |  |  |  |  |  |
Less current portion |  |  | 156,345 | 167,565 | 53,056 | 46,290 | 71,022 | 193,096 | 205,136 | 206,894
Long-term portion |  |  | 2,023,448 | $ 1,762,690 | $ 1,905,515 | $ 1,915,843 | $ 1,936,744 | $ 2,046,264 | $ 2,051,567 | $ 1,958,907
Unsecured debt | Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 1.30% |  |  |  |  |  |
Unsecured debt | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 15.25% |  |  |  |  |  |
Term loans from cooperative and other banks, due in installments through 2018 | Line of credit | Revolving credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 5.59% |  |  |  |  |  |
Total long-term debt |  |  | 15,000 | $ 0 |  |  |  |  |  |
Committed Term Loans, September 2015 [Member] | Secured debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total long-term debt |  |  |  | 236,000 |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | 600,000 |  |  |  |  |  |
Debt Instrument, Term |  | 10 years |  |  |  |  |  |  |  |
Notes Payable, Other Payables [Member] | Notes Payable, Other Payables [Member] | Revolving credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Notes payable |  |  | 1,695,423 | $ 1,437,264 |  |  |  |  |  |
Private placement, payable in equal installments beginning in 2014 through 2018 | Unsecured debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 6.18% |  |  |  |  |  |
Total long-term debt |  |  | 80,000 | $ 0 |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 400,000 |  |  |  |  |  |
Private placement, payable in installments through 2018 | Unsecured debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 5.60% |  |  |  |  |  |
Total long-term debt |  |  | 4,615 | $ 0 |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | 60,000 |  |  |  |  |  |
Private placement, payable in equal installments beginning in 2014 through 2018 | Unsecured debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total long-term debt |  |  | 10,000 | $ 0 |  |  |  |  |  |
Private placement, payable in equal installments beginning in 2014 through 2018 | Notes Payable, Other Payables [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 5.78% |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 50,000 |  |  |  |  |  |
Private placement, payable in equal installments beginning in 2017 through 2021 | Unsecured debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total long-term debt |  |  | 80,000 | $ 60,000 |  |  |  |  |  |
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 |  |  |  |  |  |
Private placement, payable in its entirety in 2019 | Unsecured debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 4.08% |  |  |  |  |  |
Total long-term debt |  |  | 130,690 | $ 129,229 |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 130,000 |  |  |  |  |  |
Private placement, payable in its entirety in 2021 | Unsecured debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 4.52% |  |  |  |  |  |
Total long-term debt |  |  | 163,496 | $ 157,528 |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 160,000 |  |  |  |  |  |
Private placement, payable in its entirety in 2023 | Unsecured debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 4.67% |  |  |  |  |  |
Total long-term debt |  |  | 135,792 | $ 128,577 |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 130,000 |  |  |  |  |  |
Private placement, payable in 2023 152k [Member] [Member] | Unsecured debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 4.39% |  |  |  |  |  |
Total long-term debt |  |  | 152,000 | $ 152,000 |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 152,000 |  |  |  |  |  |
Private placement, payable in 2025 80k [Member] | Unsecured debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 3.85% |  |  |  |  |  |
Total long-term debt |  |  | 80,000 | $ 80,000 |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 80,000 |  |  |  |  |  |
Private placement, payable in 2025 100k [Member] | Unsecured debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 3.80% |  |  |  |  |  |
Total long-term debt |  |  | 100,000 | $ 100,000 |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 100,000 |  |  |  |  |  |
Private placement, payable in 2025 150k [Member] [Member] | Unsecured debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 4.58% |  |  |  |  |  |
Total long-term debt |  |  | 149,293 | $ 145,213 |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 150,000 |  |  |  |  |  |
Private placement, payable in its entirety in 2026 | Unsecured debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 4.82% |  |  |  |  |  |
Total long-term debt |  |  | 80,000 | $ 80,000 |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 80,000 |  |  |  |  |  |
Private placement, payable in its entirety in 2027 [Member] | Unsecured debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 4.69% |  |  |  |  |  |
Total long-term debt |  |  | 58,000 | $ 58,000 |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 58,000 |  |  |  |  |  |
Private placement, payable in its entirety in 2028 [Member] | Unsecured debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 4.74% |  |  |  |  |  |
Total long-term debt |  |  | 95,000 | $ 95,000 |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 95,000 |  |  |  |  |  |
Private placement, payable in its entirety in 2031 [Member] | Unsecured debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 4.89% |  |  |  |  |  |
Total long-term debt |  |  | 100,000 | $ 100,000 |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 100,000 |  |  |  |  |  |
Private placement, payable in its entirety 2033 [Member] | Unsecured debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 4.71% |  |  |  |  |  |
Total long-term debt |  |  | 100,000 | $ 100,000 |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 100,000 |  |  |  |  |  |
Private placement, payable in its entirety in 2036 [Member] | Unsecured debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 5.40% |  |  |  |  |  |
Total long-term debt |  |  | 125,000 | $ 125,000 |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | 125,000 |  |  |  |  |  |
Private Placement [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total long-term debt |  |  | 1,643,886 | $ 1,510,547 |  |  |  |  |  |
Term loans, 430K payable in 2025 [Member] | Unsecured debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 2.25% |  |  |  |  |  |
Total long-term debt |  |  | 430,000 | $ 366,000 |  |  |  |  |  |
Bank financing [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total long-term debt |  |  | 445,000 | 366,000 |  |  |  |  |  |
Other notes and contracts | Secured debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total long-term debt |  |  | 62,652 | 32,607 |  |  |  |  |  |
Committed Term Loans, September 2016 [Member] | Secured debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total long-term debt |  |  |  | $ 130,000 |  |  |  |  |  |
Debt instrument, amount available to be paid and re-advanced | $ 300,000 |  |  |  |  |  |  |  |  |
Amount re-advanced |  |  | $ 130,000 |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 600,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Term | 10 years |  |  |  |  |  |  |  |  |

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