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Commitments and Contingencies - Unconditional Purchase Obligations (Details) (USD $) | Feb. 28, 2013
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Unrecorded Unconditional Purchase Obligation [Line Items] |
Unrecorded Unconditional Purchase Obligation, Minimum Amount Required | $ 505,000,000
Unrecorded Unconditional Purchase Obligation, Long-Term | 600,716,000
Unrecorded Unconditional Purchase Obligation, Long-Term, Due in Next Twelve Months | 63,778,000
Unrecorded Unconditional Purchase Obligation, Long-Term, Due Within Two to Three Years | 137,051,000
Unrecorded Unconditional Purchase Obligation, Long-Term, Due Within Four to Five Years | 122,140,000
Unrecorded Unconditional Purchase Obligation, Long-Term, Due after Five Years | $ 277,747,000

X
- Definition Unrecorded Unconditional Purchase Obligation, Long-Term + References No definition available. + Details
Name: | chscp_UnrecordedUnconditionalPurchaseObligationLongTerm
Namespace Prefix: | chscp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition Unrecorded Unconditional Purchase Obligation, Long-Term, Due in Next Twelve Months + References No definition available. + Details
Name: | chscp_UnrecordedUnconditionalPurchaseObligationLongTermDueInNextTwelveMonths
Namespace Prefix: | chscp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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

X
- 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

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