XML 253 R106.htm IDEA: XBRL DOCUMENT v3.25.3

SEGMENT INFORMATION (External Net Sales from Continuing Operations by Major Product) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2025	Aug. 31, 2024	Aug. 31, 2023
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	$ 7,798,480	$ 7,925,972	$ 8,799,533
Segments
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	7,749,655	7,875,693	8,754,842
Eliminations
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	128,388	109,777	118,677
North America Steel Group
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	6,150,802	6,383,106	6,797,827
North America Steel Group | Segments
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	6,083,849	6,309,730	6,704,305
North America Steel Group | Eliminations
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	66,953	73,376	93,522
Emerging Businesses Group
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	806,082	750,754	744,548
Emerging Businesses Group | Segments
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	747,486	717,397	721,746
Emerging Businesses Group | Eliminations
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	58,596	33,357	22,802
Europe Steel Group
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	921,159	851,610	1,331,144
Europe Steel Group | Segments
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	918,320	848,566	1,328,791
Europe Steel Group | Eliminations
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	2,839	3,044	2,353
Corporate and Other
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	(79,563)	(59,498)	(73,986)
Corporate and Other | Segments
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	48,825	50,279	44,691
Raw materials | Segments
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	1,328,612	1,329,938	1,345,383
Raw materials | North America Steel Group | Segments
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	1,305,753	1,311,995	1,324,373
Raw materials | Emerging Businesses Group | Segments
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	0	0	0
Raw materials | Europe Steel Group | Segments
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	22,859	17,943	21,010
Raw materials | Corporate and Other | Segments
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	0	0	0
Steel products | Segments
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	3,291,479	3,237,358	3,845,702
Steel products | North America Steel Group | Segments
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	2,564,107	2,564,472	2,776,572
Steel products | Emerging Businesses Group | Segments
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	0	0	0
Steel products | Europe Steel Group | Segments
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	727,372	672,886	1,069,130
Steel products | Corporate and Other | Segments
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	0	0	0
Downstream products | Segments
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	2,287,011	2,496,696	2,729,780
Downstream products | North America Steel Group | Segments
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	1,993,761	2,217,621	2,417,045
Downstream products | Emerging Businesses Group | Segments
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	163,409	157,644	118,321
Downstream products | Europe Steel Group | Segments
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	129,841	121,431	194,414
Downstream products | Corporate and Other | Segments
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	0	0	0
Construction products | Segments
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	304,130	290,304	332,940
Construction products | North America Steel Group | Segments
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	0	0	0
Construction products | Emerging Businesses Group | Segments
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	304,130	290,304	332,940
Construction products | Europe Steel Group | Segments
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	0	0	0
Construction products | Corporate and Other | Segments
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	0	0	0
Ground stabilization solutions | Segments
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	261,738	250,941	256,148
Ground stabilization solutions | North America Steel Group | Segments
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	0	0	0
Ground stabilization solutions | Emerging Businesses Group | Segments
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	261,738	250,941	256,148
Ground stabilization solutions | Europe Steel Group | Segments
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	0	0	0
Ground stabilization solutions | Corporate and Other | Segments
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	0	0	0
Other | Segments
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	325,510	320,735	289,580
Other | North America Steel Group | Segments
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	220,228	215,642	186,315
Other | Emerging Businesses Group | Segments
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	18,209	18,508	14,337
Other | Europe Steel Group | Segments
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	38,248	36,306	44,237
Other | Corporate and Other | Segments
Entity-Wide Information, Revenue from External Customer [Line Items]
Net sales	$ 48,825	$ 50,279	$ 44,691

X

- 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

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

X

- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 41
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-41

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-42

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-7

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 270
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482964/270-10-50-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (ee)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 6: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 7: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 924
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479941/924-10-S99-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-5

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 30
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-30

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-22

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 40
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-40

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-22

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-4

+ Details

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

X

- Details

Name:	srt_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ConsolidationItemsAxis=us-gaap_IntersegmentEliminationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=cmc_NorthAmericaSteelGroupMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=cmc_EmergingBusinessGroupMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=cmc_EuropeSteelGroupMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=us-gaap_CorporateAndOtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=cmc_RawMaterialProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=cmc_SteelProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=cmc_DownstreamProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=cmc_ConstructionProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=cmc_GroundStabilizationProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=cmc_OtherProductMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: