XML 62 R51.htm IDEA: XBRL DOCUMENT
v3.3.1.900

NEW MARKET TAX CREDIT TRANSACTIONS (Details) $ in Millions | 1 Months Ended
--- | ---
Dec. 31, 2015 USD ($)
Income Tax Contingency [Line Items] |
Capital contributions received by the Investment Fund | $ 17.7
Commonwealth |
Income Tax Contingency [Line Items] |
Loan receivable from Investment Fund | $ 35.3
Loan receivable from investment fund, interest rate (percent) | 1.08%
Investment Fund |
Income Tax Contingency [Line Items] |
Qualified equity investment into community development entities | $ 51.5
Quality Equity Investment Loan | CMC Steel Oklahoma, LLC |
Income Tax Contingency [Line Items] |
Loans payable to community development entities | $ 50.7

X
- Definition Capital Contributions Received under New Markets Tax Credit Program + References No definition available. + Details
Name: | cmc_CapitalContributionsReceivedunderNewMarketsTaxCreditProgram
Namespace Prefix: | cmc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Loan Receivable, Stated Interest Rate + References No definition available. + Details
Name: | cmc_LoanReceivableStatedInterestRate
Namespace Prefix: | cmc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Qualified Equity Investment into Community Development Entities + References No definition available. + Details
Name: | cmc_QualifiedEquityInvestmentintoCommunityDevelopmentEntities
Namespace Prefix: | cmc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_IncomeTaxContingencyLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
Name: | us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Including the current and noncurrent portions, aggregate carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)(2)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
Name: | us-gaap_LoansPayable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=us-gaap_SubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cmc_InvestmentFundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=cmc_QualityEquityInvestmentLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cmc_CMCSteelOklahomaLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |