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DERIVATIVES AND RISK MANAGEMENT (Commodity Contract Commitments) (Details)
 6 Months Ended
Feb. 28, 2015
t
Aluminum | Long  
Derivative [Line Items]  
Commodity contract commitments 4,246us-gaap_DerivativeNonmonetaryNotionalAmountMass
/ us-gaap_DerivativeByNatureAxis
= cmc_AluminumMember
/ us-gaap_PositionAxis
= us-gaap_LongMember
Aluminum | Short  
Derivative [Line Items]  
Commodity contract commitments 225us-gaap_DerivativeNonmonetaryNotionalAmountMass
/ us-gaap_DerivativeByNatureAxis
= cmc_AluminumMember
/ us-gaap_PositionAxis
= us-gaap_ShortMember
Copper | Long  
Derivative [Line Items]  
Commodity contract commitments 1,457us-gaap_DerivativeNonmonetaryNotionalAmountMass
/ us-gaap_DerivativeByNatureAxis
= cmc_CopperMember
/ us-gaap_PositionAxis
= us-gaap_LongMember
Copper | Short  
Derivative [Line Items]  
Commodity contract commitments 5,381us-gaap_DerivativeNonmonetaryNotionalAmountMass
/ us-gaap_DerivativeByNatureAxis
= cmc_CopperMember
/ us-gaap_PositionAxis
= us-gaap_ShortMember
Zinc | Long  
Derivative [Line Items]  
Commodity contract commitments 29us-gaap_DerivativeNonmonetaryNotionalAmountMass
/ us-gaap_DerivativeByNatureAxis
= cmc_ZincMember
/ us-gaap_PositionAxis
= us-gaap_LongMember
Natural Gas | Long  
Derivative [Line Items]  
Energy contract commitments 360,000,000,000us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure
/ us-gaap_DerivativeByNatureAxis
= us-gaap_NaturalGasReservesMember
/ us-gaap_PositionAxis
= us-gaap_LongMember