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v3.19.1

ACQUISITION - Acquired Amortizable Intangible Assets (Liabilities) (Details) - USD ($) $ in Thousands | Nov. 05, 2018 | Feb. 28, 2019 | Aug. 31, 2018
--- | --- | --- | ---
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Unfavorable contract backlog | $ (110,166) | $ (75,358) | $ 0
Minimum |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Life in years, unfavorable contract backlog | 1 year |  |
Maximum |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Life in years, unfavorable contract backlog | 2 years |  |
Real Property | Minimum |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Life in years, asset | 1 year |  |
Real Property | Maximum |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Life in years, asset | 35 years |  |
Personal Property | Minimum |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Life in years, asset | 1 year |  |
Personal Property | Maximum |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Life in years, asset | 25 years |  |

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- Definition Business Combination, Acquired Unfavorable Contract Backlog + References No definition available. + Details
Name: | cmc_BusinessCombinationAcquiredUnfavorableContractBacklog
Namespace Prefix: | cmc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Finite-lived Intangible Liability, Useful Life + References No definition available. + Details
Name: | cmc_FinitelivedIntangibleLiabilityUsefulLife
Namespace Prefix: | cmc_
Data Type: | xbrli:durationItemType
Balance Type: | na
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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=cmc_RealPropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=cmc_PersonalPropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |