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ACCOUNTS RECEIVABLE PROGRAMS (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Aug. 31, 2018 | Aug. 31, 2017
Deferred purchase price receivables |  |
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items] |  |
Transfers of trade accounts receivable | $ 2,932,379 | $ 2,646,513
Collections | 2,187,377 | 1,899,088
Exit from programs |  | (124,302)
International Marketing and Distribution | Deferred purchase price receivables | Domestic Country Sale of Accounts Receivable |  |
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items] |  |
Transfers of trade accounts receivable |  | 354,500
Collections |  | 325,700
Exit from programs |  | 83,700
Australia | Deferred purchase price receivables |  |
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items] |  |
Transfers of trade accounts receivable | 0 | 16,914
Collections | 0 | 13,537
Exit from programs |  | (33,917)
Australia | Businesses Sold or Held for Sale |  |
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items] |  |
Collections |  | 3,700
Exit from programs |  | 1,600
United States |  |
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items] |  |
Advance payments outstanding | 0 |
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 accounts receivable | 2,396,780 | 2,251,118
Collections | 1,818,781 | 1,635,701
Exit from programs |  | (90,385)
Poland |  |
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items] |  |
Advance payments outstanding | 12,100 |
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 accounts receivable | 535,599 | 378,481
Collections | 368,596 | 249,850
Exit from programs |  | $ 0
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 accounts receivable | $ 381,100 |

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

X
- Definition It represents the amount of customer receivables returned or repurchased in the sales of accounts receivable program during the reporting period. + References No definition available. + Details
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Namespace Prefix: | cmc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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
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Namespace Prefix: | cmc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Cash Flows between a transferor and a transferee attributable to collections reinvested in revolving period transfers related to either a securitization, asset-backed financing arrangement, or similar transfer in which the transferor has continuing involvement with the transferred financial assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in the transferred financial assets). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=109247956&loc=d3e107207-111719 + Details
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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
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- Details
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- Details
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- Details
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