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REVENUE RECOGNITION - Revenue Recognition Method (Details) - Americas Fabrication - Recognized over Time | 3 Months Ended
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Nov. 30, 2021 | Nov. 30, 2020
Fabricated Product and Installation Services |  |
Disaggregation of Revenue [Line Items] |  |
Contract as percent of total segment revenue (percent) | 9.00% | 14.00%
Fabricated Product without Installation Services |  |
Disaggregation of Revenue [Line Items] |  |
Contract as percent of total segment revenue (percent) | 9.00% | 9.00%

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- Definition Contract with Customer, Contract as Percent of Total Revenue + References No definition available. + Details
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Namespace Prefix: | cmc_
Data Type: | num:percentItemType
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
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=cmc_FabricatedProductandInstallationServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_TimingOfTransferOfGoodOrServiceAxis=us-gaap_TransferredOverTimeMember
Namespace Prefix: |
Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |