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Notes Payable and Long-Term Debt Phantom (Details) $ in Millions | 12 Months Ended
--- | ---
Aug. 31, 2015 USD ($)
Debt Instrument [Line Items] |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum | 1.30%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum | 15.25%
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 equal installments beginning in 2011 through 2015 |
Debt Instrument [Line Items] |
Interest rate | 5.25%
Debt Instrument, Face Amount | $ 125
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 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 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 2033 [Member] |
Debt Instrument [Line Items] |
Interest rate | 4.71%
Debt Instrument, Face Amount | $ 100
Notes Payable, Other Payables [Member] | Private placement, note purchase and private shelf agreement with Prudential Capital Group, 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, note purchase and private shelf agreement with Prudential Capital Group, payable in equal installments beginning in 2017 through 2021 [Member] |
Debt Instrument [Line Items] |
Interest rate | 4.00%
Debt Instrument, Face Amount | $ 100
Revolving credit facility | Line of credit | Revolving term loans from cooperative and other banks |
Debt Instrument [Line Items] |
Interest rate | 5.59%

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