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Other Assets - Rollforward of Capitalized Maintenance Activity (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Aug. 31, 2012 | Aug. 31, 2011 | Aug. 31, 2010
Capitalized Maintenance Expense [Roll Forward] |  |  |
Balance at Beginning of Year | $ 80,752 | $ 19,097 | $ 30,075
Cost Deferred | 23,443 | 92,129 | 7,554
Amortization | (33,641) | (30,474) | (18,532)
Write-Offs |  |  |
Balance at End of Year | $ 70,554 | $ 80,752 | $ 19,097

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- Definition Capitalized Maintenance Expense, Amortization + References No definition available. + Details
Name: | chscp_CapitalizedMaintenanceExpenseAmortization
Namespace Prefix: | chscp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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 Capitalized Maintenance Expense Noncurrent + References No definition available. + Details
Name: | chscp_CapitalizedMaintenanceExpenseNoncurrent
Namespace Prefix: | chscp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | chscp_CapitalizedMaintenanceExpenseRollForward
Namespace Prefix: | chscp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Capitalized Maintenance Expense, Write-Offs + References No definition available. + Details
Name: | chscp_CapitalizedMaintenanceExpenseWriteOffs
Namespace Prefix: | chscp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration