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ACCOUNTS RECEIVABLE PROGRAMS (Narrative) (Details) $ in Thousands | 9 Months Ended
--- | ---
May 31, 2018 USD ($)
Deferred purchase price receivables |
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items] |
Transfers of trade receivables | $ 2,116,243
Financial Institutions | Deferred purchase price receivables |
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items] |
Transfers of trade receivables | 352,200
UNITED STATES | Deferred purchase price receivables |
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items] |
Transfers of trade receivables | 1,741,451
Advance payment received on sale of accounts receivable | 0
Poland |
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items] |
Advance payment received on sale of accounts receivable | 18,100
Poland | Deferred purchase price receivables |
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items] |
Transfers of trade receivables | $ 374,792

X
- Definition It represents actual amount of advance payment received on accounts receivable sold. + References No definition available. + Details
Name: | cmc_AdvancePaymentReceivedOnSaleOfAccountReceivable
Namespace Prefix: | cmc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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

X
- 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

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

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

X
- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_PL
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |