Receivables - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
Feb. 28, 2017	Feb. 28, 2017	Aug. 31, 2016
Notes Receivable, Long-Term
Interest Income Accrual Term, Discontinued		90 days
CHS Capital long-term notes receivable additional available credit of counterparty	$ 806.9	$ 806.9
Minimum [Member]
Notes Receivable, Short-Term
CHS Capital notes receivable, current, term		12 months
Maximum [Member]
Notes Receivable, Short-Term
CHS Capital notes receivable, current, term		14 months
CHS Capital Notes Receivable [Member]
Notes Receivable, Long-Term
CHS Capital long-term notes receivable, non-current, term		10 years
CHS Capital long-term notes receivable	$ 315.3	$ 315.3	$ 322.4
Percentage of commercial notes to CHS Capital long-term notes receivable	48.00%	48.00%	26.00%
Percentage of producer notes to CHS Capital long-term notes receivable	52.00%	52.00%	74.00%
CHS Capital notes past due, percent past due		12.10%	2.50%
CHS Capital loan loss reserves	$ 133.5	$ 133.5	$ 45.8
All other third party borrowers [Member] \| CHS Capital Notes Receivable [Member]
Notes Receivable, Long-Term
Concentration Risk, Percentage	10.00%
Customer Concentration Risk [Member] \| CHS Capital Notes Receivable [Member]
Notes Receivable, Long-Term
Concentration Risk, Percentage			20.00%

Commercial Notes to Notes and Loans Receivable, Net, Noncurrent, Percentage

No definition available.

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- Definition

Interest Income Accrual Term, Discontinued

+ References

No definition available.

+ Details

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- Definition

Notes and Loans Receivable, Current, Term

+ References

No definition available.

+ Details

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- Definition

Notes and Loans Receivables, Net, Noncurrent, Remaining Borrowing Capacity of Counterparty

+ References

No definition available.

+ Details

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- Definition

Notes and Loans Receivable, Net, Non-Current, Term

+ References

No definition available.

+ Details

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- Definition

Producer Notes to Notes and Loans Receivable, Net, Noncurrent, Percentage

+ References

No definition available.

+ Details

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- References

No definition available.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592

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- Definition

Percent of nonaccrual financing receivable balances outstanding that are past due.

+ References

No definition available.

+ Details

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- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(d))
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

+ Details

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Balance Type:	credit
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- References

No definition available.

+ Details

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- Definition

An amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date more than one year from the balance sheet date, net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Details

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- Details

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