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Benefit Plans - Rollforward of Benefit Obligation and Plan Assets Funded (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2013
Qualified Pension Benefits      
Component of net periodic benefit costs: [Abstract]      
Service costs $ 36,006 $ 30,417 $ 31,387
Interest costs 28,046 29,900 25,445
Expected return on assets (49,746) (47,655) (49,728)
Settlement of retiree obligations 0 0 0
Prior service cost (credit) amortization 1,631 1,593 1,597
Actuarial loss (gain) amortization 19,621 18,228 22,615
Transition amount amortization 0 0 0
Periodic benefit costs, net $ 35,558 $ 32,483 $ 31,316
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]      
Discount rate 4.00% 4.80% 3.80%
Expected return on plan assets 6.50% 6.75% 7.25%
Rate of compensation increase 4.90% 4.85% 4.50%
Weighted-average assumptions to determine the net periodic benefit cost: [Abstract]      
Discount rate 4.20% 4.00% 4.80%
Rate of compensation increase 4.90% 4.90% 4.85%
Non-Qualified Pension Benefits      
Component of net periodic benefit costs: [Abstract]      
Service costs $ 875 $ 860 $ 721
Interest costs 1,414 1,660 1,316
Expected return on assets 0 0 0
Settlement of retiree obligations 1,635 0 0
Prior service cost (credit) amortization 228 229 228
Actuarial loss (gain) amortization 1,058 957 921
Transition amount amortization 0 0 0
Periodic benefit costs, net $ 5,210 $ 3,706 $ 3,186
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]      
Discount rate 4.00% 4.50% 4.25%
Rate of compensation increase 5.15% 4.75% 4.75%
Weighted-average assumptions to determine the net periodic benefit cost: [Abstract]      
Discount rate 4.50% 4.50% 4.50%
Rate of compensation increase 4.80% 4.80% 4.75%
Other Benefits      
Component of net periodic benefit costs: [Abstract]      
Service costs $ 1,513 $ 1,729 $ 2,936
Interest costs 1,489 1,918 2,275
Expected return on assets 0 0 0
Settlement of retiree obligations 0 0 0
Prior service cost (credit) amortization (426) (493) (120)
Actuarial loss (gain) amortization (431) (180) 1,104
Transition amount amortization 0 0 562
Periodic benefit costs, net $ 2,145 $ 2,974 $ 6,757
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]      
Discount rate 4.20% 3.75% 3.75%
Weighted-average assumptions to determine the net periodic benefit cost: [Abstract]      
Discount rate 3.75% 4.60% 3.75%