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Commitments and Contingencies - Purchase Obligations (Details) (USD $) | 12 Months Ended
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Aug. 31, 2014 | Aug. 31, 2013 | Aug. 31, 2012
Unrecorded Unconditional Purchase Obligation [Line Items] |  |  |
Long-term unconditional purchase obligations, Total | $ 485,739,000 |  |
Long-term unconditional purchase obligations, Less than 1 Year | 68,008,000 |  |
Long-term unconditional purchase obligations, 1 - 3 Years | 124,367,000 |  |
Long-term unconditional purchase obligations, 3 - 5 Years | 87,809,000 |  |
Long-term unconditional purchase obligations, More than 5 Years | 205,555,000 |  |
Long-term unconditional purchase obligations, minimum amount required | 415,000,000 |  |
Long-term unconditional purchase obligations, period amount purchase | $ 65,500,000 | $ 62,400,000 | $ 47,800,000

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- Definition Unrecorded Unconditional Purchase Obligation, Long-Term, Due Within Four to Five Years + References No definition available. + Details
Name: | chscp_UnrecordedUnconditionalPurchaseObligationLongTermDueWithinFourToFiveYears
Namespace Prefix: | chscp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Unrecorded Unconditional Purchase Obligation, Long-Term, Due Within Two to Three Years + References No definition available. + Details
Name: | chscp_UnrecordedUnconditionalPurchaseObligationLongTermDueWithinTwoToThreeYears
Namespace Prefix: | chscp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Unrecorded Unconditional Purchase Obligation, Minimum Amount Required + References No definition available. + Details
Name: | chscp_UnrecordedUnconditionalPurchaseObligationMinimumAmountRequired
Namespace Prefix: | chscp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Unrecorded Unconditional Purchase Obligation, Period Amount Purchased + References No definition available. + Details
Name: | chscp_UnrecordedUnconditionalPurchaseObligationPeriodAmountPurchased
Namespace Prefix: | chscp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
Name: | us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
Name: | us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing after the fifth 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
Name: | us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_UnrecordedUnconditionalPurchaseObligationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration