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Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Nov. 30, 2014 Refineries | Nov. 30, 2013
Finite-Lived Intangible Assets [Line Items] |  |
Number of Refineries | 2 chscp_NumberOfRefineries |
Expenditures for Major Repairs | $ 1,088 chscp_ExpendituresForMajorRepairs | $ 0 chscp_ExpendituresForMajorRepairs
Capitalized Maintenance Expense, Deferred During the Period | $ 1,100 chscp_CapitalizedMaintenanceExpenseDeferredDuringPeriod | $ 0 chscp_CapitalizedMaintenanceExpenseDeferredDuringPeriod
Minimum [Member] | Major Maintenance Activities Requiring Shutdown [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life | 2 years |
Maximum [Member] | Major Maintenance Activities Requiring Shutdown [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life | 4 years |

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- Definition Capitalized Maintenance Expense, Deferred During the Period + References No definition available. + Details
Name: | chscp_CapitalizedMaintenanceExpenseDeferredDuringPeriod
Namespace Prefix: | chscp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Payments for planned major maintenance at refineries to overhaul, repair, inspect and replace process materials and equipment. + References No definition available. + Details
Name: | chscp_ExpendituresForMajorRepairs
Namespace Prefix: | chscp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Number of Refineries + References No definition available. + Details
Name: | chscp_NumberOfRefineries
Namespace Prefix: | chscp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |