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Benefit Plans - Narrative (Details) $ in Thousands | 12 Months Ended
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Aug. 31, 2018 USD ($) Employers | Aug. 31, 2017 USD ($) | Aug. 31, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, health care benefits annual rate of increase in the per capita cost | 7.50% |  |
Defined benefit plan, health care benefits, decrease in the per capita cost trend rate | 4.50% |  |
Defined contribution plan, contributions by employer | $ 24,700 | $ 19,900 | $ 29,500
Pension protection act, percentage of employers that are rural cooperatives or cooperative organizations owned by agricultural producers, criteria | 85.00% |  |
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation | $ 736,200 | 743,500 |
Defined benefit plan, expected future benefit payments, next twelve months | $ 66,528 |  |
Pension Benefits | Multiemployer Plans, Pension | Co-op Retirement Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of employers contributing to Co-op Retirement Plan (in number of employers) | Employers | 400 |  |
Non-Qualified Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation | $ 18,600 | $ 20,600 |
Defined benefit plan, expected future benefit payments, next twelve months | 1,780 |  |
Other Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, expected future benefit payments, next twelve months | 2,040 |  |
Pension Plans And Postretirement Plans, Defined Benefit, Non-Qualified [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, expected future benefit payments, next twelve months | $ 3,800 |  |
Maximum | Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, target allocation percentage | 65.00% |  |
Maximum | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, target allocation percentage | 55.00% |  |
Maximum | Pension Benefits | Multiemployer Plans, Pension | Co-op Retirement Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions as percent of total contributions of all contributing employers | 5.00% |  |
Minimum | Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, target allocation percentage | 45.00% |  |
Minimum | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, target allocation percentage | 35.00% |  |
Minimum | Pension Benefits | Multiemployer Plans, Pension | Co-op Retirement Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, funded percentage | 80.00% |  |

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- Definition Pension Protection Act, Percentage Of Employers That Are Rural Cooperatives Or Cooperative Organizations Owned By Agricultural Producers, Criteria + References No definition available. + Details
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