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Benefit Plans - Narative (Details) $ in Thousands	12 Months Ended
	Aug. 31, 2015 USD ($) Employers	Aug. 31, 2014 USD ($)	Aug. 31, 2013 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%
Defined contribution plan, contributions by employer	$ 27,400	$ 24,600	$ 22,900
Pension protection act, percentage of employers that are rural cooperatives or cooperative organizations owned by agricultural producers, criteria	85.00%
Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, target allocation percentage	50.00%
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, target allocation percentage	50.00%
Qualified Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 693,900	682,100
Company contributions	39,165	25,700
Defined benefit plan, expected future benefit payments, next twelve months	$ 37,593
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
Co-op Retirement Plan - Contributions of CHS	$ 2,021	2,079	$ 2,095
Pension Plans And Postretirement Plans, Defined Benefit, Non-Qualified
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected future benefit payments, next twelve months	4,500
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Company contributions	1,750	2,161
Non-Qualified Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	23,600	22,700
Company contributions	6,399	$ 3,576
Defined benefit plan, expected future benefit payments, next twelve months	$ 1,753
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 | 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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Multiemployer Plans, Employer Contributions as Percent of Total

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Multiemployer Plans, Number of Participating Employers

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Pension Protection Act, Percentage Of Employers That Are Rural Cooperatives Or Cooperative Organizations Owned By Agricultural Producers, Criteria

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For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Accumulated Benefit Obligation



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The increase in the fair value of plan assets from contributions made by the employer.

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Amount of benefits from a defined benefit plan expected to be paid in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Plan assets of a defined benefit plan, as a percentage of projected benefit obligation.

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The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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-Glossary Health Care Cost Trend Rate



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Target allocation of investments of this type to total plan assets presented on a weighted average basis.

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The ultimate trend rate for health care costs.

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Amount of discretionary contributions made by an employer to a defined contribution plan.

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Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

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