XML 76 R51.htm IDEA: XBRL DOCUMENT
v3.24.3

NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2023 USD ($) | Aug. 31, 2024 USD ($) mill segments | Aug. 31, 2023 USD ($) | Aug. 31, 2022 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |
Number of business segments | segments |  | 3 |  |
Number Of Electric Arc Furnace Mini Mills | mill |  | 6 |  |
Number Of Electric Arc Furnace Micro Mills | mill |  | 3 |  |
Number of rerolling mills | mill |  | 1 |  |
Asset impairments: | $ 3,500 | $ 6,708 | $ 3,780 | $ 4,926
Realized and unrealized gain (loss) on investment and foreign currency |  | (7,700) | (12,100) | 9,600
West Virginia Economic Development Authority |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Agreement For Performance Based Principal Reduction Loan |  | 75,000 |  |
Proceeds From Performance Based Principal Reduction Loan |  |  | 5,000 |
Poland Compensation Scheme Act |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Proceeds From Government Grants Related To Income |  | 29,200 | 9,500 | $ 15,500
Energy Aid Program, 2022 |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Proceeds From Government Grants Related To Income |  | $ 40,200 | $ 4,300 |
Receivables secured by credit insurance or letters of credit |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Percentage of accounts receivable secured by credit insurance or letters of credit | 14.00% | 13.00% | 14.00% |

X
- Definition Agreement For Performance Based Principal Reduction Loan + References No definition available. + Details
Name: | cmc_AgreementForPerformanceBasedPrincipalReductionLoan
Namespace Prefix: | cmc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number Of Electric Arc Furnace Micro Mills + References No definition available. + Details
Name: | cmc_NumberOfElectricArcFurnaceMicroMills
Namespace Prefix: | cmc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number Of Electric Arc Furnace Mini Mills + References No definition available. + Details
Name: | cmc_NumberOfElectricArcFurnaceMiniMills
Namespace Prefix: | cmc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Rerolling Mills + References No definition available. + Details
Name: | cmc_NumberOfRerollingMills
Namespace Prefix: | cmc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Ratio of secured accounts receivable to total accounts receivable, expressed as a percentage. + References No definition available. + Details
Name: | cmc_PercentageOfSecuredAccountsReceivable
Namespace Prefix: | cmc_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Proceeds From Government Grants Related To Income + References No definition available. + Details
Name: | cmc_ProceedsFromGovernmentGrantsRelatedToIncome
Namespace Prefix: | cmc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Proceeds From Performance Based Principal Reduction Loan + References No definition available. + Details
Name: | cmc_ProceedsFromPerformanceBasedPrincipalReductionLoan
Namespace Prefix: | cmc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482130/360-10-45-4 + Details
Name: | us-gaap_AssetImpairmentCharges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, before tax, of realized and unrealized gain (loss) on investment and derivative, classified as operating, and foreign currency transaction. Investment includes, but is not limited to, debt and equity securities, security sold short, real estate, and commodity. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 946 -SubTopic 830 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480167/946-830-55-10 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section 45 -Paragraph 6 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483581/946-220-45-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 830 -Name Accounting Standards Codification -Section 45 -Paragraph 36 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480228/946-830-45-36 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(8)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1 + Details
Name: | us-gaap_InvestmentCompanyRealizedAndUnrealizedGainLossOnInvestmentAndForeignCurrency
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-18 + Details
Name: | us-gaap_NumberOfOperatingSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
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_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | us-gaap_GovernmentAssistanceTypeAxis=cmc_PolandCompensationSchemeActMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GovernmentAssistanceTypeAxis=cmc_EnergyAidProgram2022Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=cmc_SecuredAccountsReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |