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Fair Value Measurements Recurring Fair Value Measurements by Level (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Thousands, unless otherwise specified
Nov. 30, 2014
Aug. 31, 2014
Fair Value, Inputs, Level 1 [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Inventory, Current, Fair Value Disclosure $ 0chscp_InventoryCurrentFairValueDisclosure
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= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 $ 0chscp_InventoryCurrentFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Other Assets, Fair Value Disclosure 9,583us-gaap_OtherAssetsFairValueDisclosure
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Assets, Fair Value Disclosure 236,515us-gaap_AssetsFairValueDisclosure
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= us-gaap_FairValueInputsLevel1Member
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/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Liabilities, Fair Value Disclosure 229,712us-gaap_LiabilitiesFairValueDisclosure
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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Fair Value, Inputs, Level 2 [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Inventory, Current, Fair Value Disclosure 1,564,403chscp_InventoryCurrentFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
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Other Assets, Fair Value Disclosure 0us-gaap_OtherAssetsFairValueDisclosure
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= us-gaap_FairValueInputsLevel2Member
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/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Assets, Fair Value Disclosure 2,121,769us-gaap_AssetsFairValueDisclosure
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= us-gaap_FairValueInputsLevel2Member
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= us-gaap_FairValueMeasurementsRecurringMember		 1,444,374us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
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= us-gaap_FairValueMeasurementsRecurringMember
Liabilities, Fair Value Disclosure 399,627us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 480,052us-gaap_LiabilitiesFairValueDisclosure
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/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Fair Value, Inputs, Level 3 [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Inventory, Current, Fair Value Disclosure 0chscp_InventoryCurrentFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 0chscp_InventoryCurrentFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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Other Assets, Fair Value Disclosure 0us-gaap_OtherAssetsFairValueDisclosure
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= us-gaap_FairValueMeasurementsRecurringMember		 0us-gaap_OtherAssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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Assets, Fair Value Disclosure 0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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= us-gaap_FairValueMeasurementsRecurringMember		 0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Liabilities, Fair Value Disclosure 86,520us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 114,917us-gaap_LiabilitiesFairValueDisclosure
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= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Estimate of Fair Value, Fair Value Disclosure [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Inventory, Current, Fair Value Disclosure 1,564,403chscp_InventoryCurrentFairValueDisclosure
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Other Assets, Fair Value Disclosure 9,583us-gaap_OtherAssetsFairValueDisclosure
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Assets, Fair Value Disclosure 2,358,284us-gaap_AssetsFairValueDisclosure
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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Liabilities, Fair Value Disclosure $ 715,859us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 $ 714,907us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember