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NATURE OF OPERATIONS AND ACCOUNTING POLICIES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Feb. 28, 2025	Feb. 28, 2025	Feb. 29, 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

X

- Definition

Proceeds From Government Assistance

+ References

No definition available.

+ Details

Name:	cmc_ProceedsFromGovernmentAssistance
Namespace Prefix:	cmc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of government assistance recognized.

+ 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

Name:	us-gaap_GovernmentAssistanceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration