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Benefit Plans - Schedule of Amortization From Other Accumulated Comprehensive Income into Net Period Benefit Costs (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Aug. 31, 2014
Defined Benefit Plan Disclosure [Line Items]  
Defined benefit plan, health care benefits annual rate of increase in the per capita cost 6.90%
Defined benefit plan, health care benefits annual rate of increase in the per capita cost trend rate 4.80%
Qualified Pension Benefits
  
Defined Benefit Plan Disclosure [Line Items]  
Amortization of prior service cost (benefit) $ 1,648
Amortization of net actuarial loss 19,604
Non-Qualified Pension Benefits
  
Defined Benefit Plan Disclosure [Line Items]  
Amortization of prior service cost (benefit) 229
Amortization of net actuarial loss 1,044
Other Benefits
  
Defined Benefit Plan Disclosure [Line Items]  
Amortization of prior service cost (benefit) (120)
Amortization of net actuarial loss $ (421)