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SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS AND RESERVES (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Aug. 31, 2016 | Aug. 31, 2015 | Aug. 31, 2014
Allowance for doubtful accounts |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Amounts reclassified to the fair value of the deferred purchase price | $ (1,401) | $ (1,695) | $ (1,010)

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- Definition Valuation allowances and reserves reclassified to fair value of deferred purchase price. + References No definition available. + Details
Name: | cmc_ValuationAllowancesAndReservesChargedReclassifiedToFairValueOfDeferredPurchasePrice
Namespace Prefix: | cmc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_ValuationAllowancesAndReservesTypeAxis=us-gaap_AllowanceForDoubtfulAccountsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |