XML 98 R60.htm IDEA: XBRL DOCUMENT v3.3.0.814

GOODWILL AND OTHER INTANGIBLE ASSETS (Changes in the Carrying Amount of Goodwill) (Details) - USD ($)		3 Months Ended	12 Months Ended
		Aug. 31, 2015	Aug. 31, 2015	Aug. 31, 2014	Aug. 31, 2013	Aug. 31, 2015	Aug. 31, 2014	Aug. 31, 2013
Goodwill [Line Items]
Goodwill		$ 76,787,000	$ 84,127,000	$ 79,074,000	$ 79,074,000	$ 76,787,000	$ 84,127,000	$ 79,074,000
Accumulated impairment losses		(10,404,000)	(9,808,000)	(9,495,000)	(9,495,000)	(10,404,000)	(9,808,000)	(9,495,000)
Goodwill, net						66,383,000	74,319,000	69,579,000
Goodwill [Abstract]
Goodwill, beginning			84,127,000	79,074,000
Acquisition				4,675,000
Translation			(669,000)	65,000
Goodwill reclassified to assets held for sale (1)	[1]		(6,643,000)
Goodwill, ending		76,787,000	76,787,000	84,127,000	79,074,000
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]
Accumulated impairment losses, beginning			(9,808,000)	(9,495,000)
Impairment			(7,267,000)	0	(6,400,000)
Accumulated impairment losses reclassified to assets held for sale (1)	[1]		6,643,000
Accumulated impairment losses, ending		(10,404,000)	(10,404,000)	(9,808,000)	(9,495,000)
Americas Recycling
Goodwill [Line Items]
Goodwill		9,751,000	9,751,000	9,751,000	9,751,000	9,751,000	9,751,000	9,751,000
Accumulated impairment losses		(9,751,000)	(2,484,000)	(2,484,000)	(2,484,000)	(9,751,000)	(2,484,000)	(2,484,000)
Goodwill, net						0	7,267,000	7,267,000
Goodwill [Abstract]
Goodwill, beginning			9,751,000	9,751,000
Acquisition				0
Translation			0	0
Goodwill reclassified to assets held for sale (1)			0
Goodwill, ending		9,751,000	9,751,000	9,751,000	9,751,000
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]
Accumulated impairment losses, beginning			(2,484,000)	(2,484,000)
Impairment			(7,267,000)		(6,400,000)
Accumulated impairment losses reclassified to assets held for sale (1)			0
Accumulated impairment losses, ending		(9,751,000)	(9,751,000)	(2,484,000)	(2,484,000)
Americas Mills
Goodwill [Line Items]
Goodwill		4,970,000	4,970,000	295,000	295,000	4,970,000	4,970,000	295,000
Accumulated impairment losses		0	0	0	0	0	0	0
Goodwill, net						4,970,000	4,970,000	295,000
Goodwill [Abstract]
Goodwill, beginning			4,970,000	295,000
Acquisition				4,675,000
Translation			0	0
Goodwill reclassified to assets held for sale (1)			0
Goodwill, ending		4,970,000	4,970,000	4,970,000	295,000
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]
Accumulated impairment losses, beginning			0	0
Impairment			0
Accumulated impairment losses reclassified to assets held for sale (1)			0
Accumulated impairment losses, ending		0	0	0	0
Americas Fabrication
Goodwill [Line Items]
Goodwill		57,637,000	57,637,000	57,637,000	57,637,000	57,637,000	57,637,000	57,637,000
Accumulated impairment losses		(493,000)	(493,000)	(493,000)	(493,000)	(493,000)	(493,000)	(493,000)
Goodwill, net						57,144,000	57,144,000	57,144,000
Goodwill [Abstract]
Goodwill, beginning			57,637,000	57,637,000
Acquisition				0
Translation			0	0
Goodwill reclassified to assets held for sale (1)			0
Goodwill, ending		57,637,000	57,637,000	57,637,000	57,637,000
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]
Accumulated impairment losses, beginning			(493,000)	(493,000)
Impairment			0
Accumulated impairment losses reclassified to assets held for sale (1)			0
Accumulated impairment losses, ending		(493,000)	(493,000)	(493,000)	(493,000)
International Mill
Goodwill [Line Items]
Goodwill		2,517,000	2,964,000	2,942,000	2,942,000	2,517,000	2,964,000	2,942,000
Accumulated impairment losses		(160,000)	(188,000)	(187,000)	(187,000)	(160,000)	(188,000)	(187,000)
Goodwill, net						2,357,000	2,776,000	2,755,000
Goodwill [Abstract]
Goodwill, beginning			2,964,000	2,942,000
Acquisition				0
Translation			$ (419,000)	21,000
Goodwill reclassified to assets held for sale (1)
Goodwill, ending		2,517,000	$ 2,517,000	2,964,000	2,942,000
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]
Accumulated impairment losses, beginning			(188,000)	(187,000)
Impairment			$ 0
Accumulated impairment losses reclassified to assets held for sale (1)
Accumulated impairment losses, ending		(160,000)	$ (160,000)	(188,000)	(187,000)
International Marketing and Distribution
Goodwill [Line Items]
Goodwill		1,912,000	8,805,000	8,449,000	8,449,000	1,912,000	8,805,000	8,449,000
Accumulated impairment losses		0	(6,643,000)	(6,331,000)	(6,331,000)	0	(6,643,000)	(6,331,000)
Goodwill, net						$ 1,912,000	$ 2,162,000	$ 2,118,000
Goodwill [Abstract]
Goodwill, beginning			8,805,000	8,449,000
Acquisition				0
Translation			(250,000)	44,000
Goodwill reclassified to assets held for sale (1)	[1]		(6,643,000)
Goodwill, ending		1,912,000	1,912,000	8,805,000	8,449,000
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]
Accumulated impairment losses, beginning			(6,643,000)	(6,331,000)
Impairment			0
Accumulated impairment losses reclassified to assets held for sale (1)	[1]		6,643,000
Accumulated impairment losses, ending		0	0	$ (6,643,000)	$ (6,331,000)
Assets Held-for-sale | International Marketing and Distribution
Goodwill [Abstract]
Goodwill reclassified to assets held for sale (1)			$ (1,600,000)
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]
Accumulated impairment losses reclassified to assets held for sale (1)		$ 1,600,000
[1] Includes $1.6 million of goodwill and $1.6 million of accumulated goodwill impairment losses related to assets that were sold during the fourth quarter of fiscal 2015

X

- Definition

Goodwill, Impaired, Accumulated Impairment Loss, Written off Related to Sale of Business Unit

+ References

No definition available.

+ Details

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

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 350



-SubTopic 20



-Section 50



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 350



-SubTopic 20



-Section 45



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

+ Details

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 350



-SubTopic 20



-Section 50



-Paragraph 1



-Subparagraph (a)



-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

+ Details

Name:	us-gaap_GoodwillAcquiredDuringPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 350



-SubTopic 20



-Section 50



-Paragraph 1



-Subparagraph (a,h)



-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

+ Details

Name:	us-gaap_GoodwillGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 350



-SubTopic 20



-Section 50



-Paragraph 1



-Subparagraph (a,h)



-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

+ Details

Name:	us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 350



-SubTopic 20



-Section 50



-Paragraph 2



-Subparagraph (b)



-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 350



-SubTopic 20



-Section 45



-Paragraph 2



-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266



Reference 3: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 230



-SubTopic 10



-Section 45



-Paragraph 28



-Subparagraph (b)



-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



Reference 4: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 350



-SubTopic 20



-Section 50



-Paragraph 1



-Subparagraph (e)



-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

+ Details

Name:	us-gaap_GoodwillImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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

X

- Definition

Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 350



-SubTopic 20



-Section 50



-Paragraph 1



-Subparagraph (f)



-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

+ Details

Name:	us-gaap_GoodwillTranslationAdjustments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 350



-SubTopic 20



-Section 50



-Paragraph 1



-Subparagraph (d)



-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

+ Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

Name:	cmc_DisposalGroupClassificationAxis=cmc_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: