XML 73 R63.htm IDEA: XBRL DOCUMENT v3.19.3

REVENUE RECOGNITION - Revenue Recognition Method (Details) - Americas Fabrication	12 Months Ended
	Aug. 31, 2019
Recognized as Amounts are Billed
Disaggregation of Revenue [Line Items]
Contract as percent of total segment revenue (percent)	52.00%
Fabricated Product and Installation Services | Recognized over Time
Disaggregation of Revenue [Line Items]
Contract as percent of total segment revenue (percent)	27.00%
Fabricated Product without Installation Services | Recognized over Time
Disaggregation of Revenue [Line Items]
Contract as percent of total segment revenue (percent)	21.00%

X

- Definition

Contract with Customer, Contract as Percent of Total Revenue

+ References

No definition available.

+ Details

Name:	cmc_ContractwithCustomerContractasPercentofTotalRevenue
Namespace Prefix:	cmc_
Data Type:	num:percentItemType
Balance Type:	na
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_DisaggregationOfRevenueLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Details

Name:	us-gaap_TimingOfTransferOfGoodOrServiceAxis=us-gaap_TransferredAtPointInTimeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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

X

- Details

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