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Notes Payable and Long-Term Debt Phantom (Details) $ in Millions | Aug. 31, 2017 USD ($)
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Unsecured debt | Private placement, payable in equal installments beginning in 2014 through 2018 |
Debt Instrument [Line Items] |
Interest rate | 6.18%
Debt Instrument, Face Amount | $ 400
Unsecured debt | Private placement, payable in installments through 2018 |
Debt Instrument [Line Items] |
Interest rate | 5.60%
Debt Instrument, Face Amount | $ 60
Unsecured debt | Private placement, payable in its entirety in 2019 |
Debt Instrument [Line Items] |
Interest rate | 4.08%
Debt Instrument, Face Amount | $ 130
Unsecured debt | Private placement, payable in its entirety in 2021 |
Debt Instrument [Line Items] |
Interest rate | 4.52%
Debt Instrument, Face Amount | $ 160
Unsecured debt | Private placement, payable in its entirety in 2023 |
Debt Instrument [Line Items] |
Interest rate | 4.67%
Debt Instrument, Face Amount | $ 130
Unsecured debt | Private placement, payable in 2023 152k [Member] [Member] |
Debt Instrument [Line Items] |
Interest rate | 4.39%
Debt Instrument, Face Amount | $ 152
Unsecured debt | Private placement, payable in 2025 80k [Member] |
Debt Instrument [Line Items] |
Interest rate | 3.85%
Debt Instrument, Face Amount | $ 80
Unsecured debt | Private placement, payable in 2025 100k [Member] |
Debt Instrument [Line Items] |
Interest rate | 3.80%
Debt Instrument, Face Amount | $ 100
Unsecured debt | Private placement, payable in 2025 150k [Member] [Member] |
Debt Instrument [Line Items] |
Interest rate | 4.58%
Debt Instrument, Face Amount | $ 150
Unsecured debt | Private placement, payable in its entirety in 2026 |
Debt Instrument [Line Items] |
Interest rate | 4.82%
Debt Instrument, Face Amount | $ 80
Unsecured debt | Private placement, payable in its entirety in 2027 [Member] |
Debt Instrument [Line Items] |
Interest rate | 4.69%
Debt Instrument, Face Amount | $ 58
Unsecured debt | Private placement, payable in its entirety in 2028 [Member] |
Debt Instrument [Line Items] |
Interest rate | 4.74%
Debt Instrument, Face Amount | $ 95
Unsecured debt | Private placement, payable in its entirety in 2031 [Member] |
Debt Instrument [Line Items] |
Interest rate | 4.89%
Debt Instrument, Face Amount | $ 100
Unsecured debt | Private placement, payable in its entirety 2033 [Member] |
Debt Instrument [Line Items] |
Interest rate | 4.71%
Debt Instrument, Face Amount | $ 100
Unsecured debt | Private placement, payable in its entirety in 2036 [Member] |
Debt Instrument [Line Items] |
Interest rate | 5.40%
Debt Instrument, Face Amount | $ 125
Unsecured debt | Term loans, 430K payable in 2025 [Member] |
Debt Instrument [Line Items] |
Interest rate | 2.25%
Notes Payable, Other Payables [Member] | Private placement, payable in equal installments beginning in 2014 through 2018 |
Debt Instrument [Line Items] |
Interest rate | 5.78%
Debt Instrument, Face Amount | $ 50
Notes Payable, Other Payables [Member] | Private placement, payable in equal installments beginning in 2017 through 2021 |
Debt Instrument [Line Items] |
Interest rate | 4.00%
Debt Instrument, Face Amount | $ 100
Revolving credit facility | Line of credit | Term loans from cooperative and other banks |
Debt Instrument [Line Items] |
Interest rate | 5.59%
Minimum | Unsecured debt |
Debt Instrument [Line Items] |
Interest rate | 1.30%
Maximum | Unsecured debt |
Debt Instrument [Line Items] |
Interest rate | 15.25%

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