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NATURE OF OPERATIONS (Narrative) (Details) | 12 Months Ended
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Aug. 31, 2016 scrap_processing_facility Components segments
Number of business segments | segments | 5
Number of geographic divisions | Components | 2
CMC Americas Division |
Number of business segments | segments | 3
CMC International Division |
Number of business segments | segments | 2
Americas Mills |
Number of scrap processing facilities | scrap_processing_facility | 10
United States |
Number of divisions | Components | 2
Singapore |
Number of recycling facilities | Components | 1

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- Definition Number of Divisions. + References No definition available. + Details
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Namespace Prefix: | cmc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of Geographic Divisions + References No definition available. + Details
Name: | cmc_NumberofGeographicDivisions
Namespace Prefix: | cmc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of Scrap Processing Facilities + References No definition available. + Details
Name: | cmc_NumberofScrapProcessingFacilities
Namespace Prefix: | cmc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of recycling facilities. + References No definition available. + Details
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Namespace Prefix: | cmc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- 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 No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementGeographicalAxis=cmc_InternationalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=country_SG
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |