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Benefit Plans - Schedule of Amortization From Other Accumulated Comprehensive Income into Net Period Benefit Costs (Details)
$ in Thousands
 12 Months Ended
Aug. 31, 2015
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Defined benefit plan, health care benefits annual rate of increase in the per capita cost 6.80%
Defined benefit plan, health care benefits, decrease in the per capita cost trend rate 5.00%
Qualified Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Amortization of prior service cost (benefit) $ 1,626
Amortization of net actuarial (gain) loss 19,017
Non-Qualified Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Amortization of prior service cost (benefit) 228
Amortization of net actuarial (gain) loss 692
Other Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Amortization of prior service cost (benefit) (120)
Amortization of net actuarial (gain) loss $ (464)