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Notes Payable and Long-Term Debt Phantom (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Aug. 31, 2014
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 equal installments through 2013 [Member]
  
Debt Instrument [Line Items]  
Interest rate 6.81%
Debt Instrument, Face Amount 225
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%