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ACCOUNTS RECEIVABLE PROGRAMS (Narrative) (Details) - Deferred purchase price receivables $ in Thousands | 6 Months Ended
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Feb. 28, 2018 USD ($)
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items] |
Transfers of trade receivables | $ 1,345,646
Financial Institutions |
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items] |
Transfers of trade receivables | $ 338,000

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- Definition It represents net transfer of customer accounts receivable during the period under the sale of accounts receivable programs. + References No definition available. + Details
Name: | cmc_Transfersofaccountsreceivable
Namespace Prefix: | cmc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_SecuritizationFinancialAssetForWhichTransferIsAccountedAsSaleLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=cmc_DeferredpurchasepricereceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_CounterpartyNameAxis=cmc_FinancialInstitutionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |