XML 100 R114.htm IDEA: XBRL DOCUMENT
v3.19.3

SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS AND RESERVES (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Aug. 31, 2018 | Aug. 31, 2017
Allowance for doubtful accounts |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Amounts reclassified to the fair value of the deferred purchase price | $ 166 | $ (1,841)

X
- Definition Valuation allowances and reserves reclassified to fair value of deferred purchase price. + References No definition available. + Details
Name: | cmc_ValuationAllowancesAndReservesChargedReclassifiedToFairValueOfDeferredPurchasePrice
Namespace Prefix: | cmc_
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: | srt_ValuationAndQualifyingAccountsDisclosureLineItems
Namespace Prefix: | srt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ValuationAllowancesAndReservesTypeAxis=us-gaap_AllowanceForCreditLossMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |