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Other Assets - Rollforward of Capitalized Maintenance Activity (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Aug. 31, 2017 | Aug. 31, 2016 | Aug. 31, 2015 | Aug. 31, 2014
Capitalized Maintenance Expense [Roll Forward] |  |  |  |
Cost Deferred | $ 3,010 | $ 949 | $ 219,898 |
Amortization | (67,058) | (73,483) | (45,953) |
Capitalized major maintenance | $ 105,006 | $ 169,054 | $ 241,588 | $ 67,643

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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 [Roll Forward] + References No definition available. + Details
Name: | chscp_CapitalizedMaintenanceExpenseRollForward
Namespace Prefix: | chscp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Capitalized major maintenance + References No definition available. + Details
Name: | chscp_Capitalizedmajormaintenance
Namespace Prefix: | chscp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant