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Benefit Plans - Narative (Details) $ in Thousands | 12 Months Ended
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Aug. 31, 2017 USD ($) Employers | Aug. 31, 2016 USD ($) | 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 | 7.90% |  |
Defined benefit plan, health care benefits, decrease in the per capita cost trend rate | 4.50% |  |
Defined contribution plan, contributions by employer | $ 19,900 | $ 29,500 | $ 27,400
Pension protection act, percentage of employers that are rural cooperatives or cooperative organizations owned by agricultural producers, criteria | 85.00% |  |
Qualified Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation | $ 740,900 | 766,200 |
Defined benefit plan, expected future benefit payments, next twelve months | $ 64,044 |  |
Qualified 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 | $ 20,600 | $ 23,700 |
Defined benefit plan, expected future benefit payments, next twelve months | 2,270 |  |
Other Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, expected future benefit payments, next twelve months | 2,140 |  |
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 | $ 4,400 |  |
Maximum | Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, target allocation percentage | 55.00% |  |
Maximum | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, target allocation percentage | 65.00% |  |
Maximum | Qualified 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 | 35.00% |  |
Minimum | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, target allocation percentage | 45.00% |  |
Minimum | Qualified 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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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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