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NATURE OF OPERATIONS AND ACCOUNTING POLICIES - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
May 31, 2025 | May 31, 2025 | May 31, 2024
Accounting Policies [Abstract] |  |  |
Government assistance |  | $ 48,100 | $ 66,300
Proceeds from government assistance related to property, plant and equipment | $ 25,000 | $ 25,000 | $ 0

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- Definition Proceeds From Government Assistance + References No definition available. + Details
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Namespace Prefix: | cmc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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 Amount of increase (decrease) in income from government assistance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 832 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483507/832-10-50-3 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration