$CMC
COMMERCIAL METALS Co Stock $cmc

$cmc Overview Financials Valuation SEC Filings Company Website

2021 Q3 Form 10-K Financial Statement

#000002244421000126 Filed on October 14, 2021

Income Statement

Concept	2021 Q3	2021	2020 Q3
Revenue	$2.031B	$6.730B	$1.409B
YoY Change	44.11%	22.88%	-8.68%
Cost Of Revenue	$1.687B	$5.624B	$1.146B
YoY Change	47.24%	24.1%	-11.32%
Gross Profit	$343.7M	$1.106B	$263.4M
YoY Change	30.47%	17.05%	4.25%
Gross Profit Margin	16.92%	16.43%	18.69%
Selling, General & Admin	$136.8M	$496.3M	$128.2M
YoY Change	6.72%	-1.29%	58.66%
% of Gross Profit	39.81%	44.88%	48.67%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$42.44M	$167.6M	$41.70M
YoY Change	1.77%	1.12%	1.46%
% of Gross Profit	12.35%	15.16%	15.83%
Operating Expenses	$136.8M	$496.3M	$128.2M
YoY Change	6.72%	-1.29%	58.66%
Operating Profit	$206.9M	$609.5M	$135.2M
YoY Change	52.99%	37.91%	-21.33%
Interest Expense	-$11.66M	$51.90M	-$14.00M
YoY Change	-16.72%	-16.06%	-13.58%
% of Operating Profit	-5.64%	8.52%	-10.35%
Other Income/Expense, Net
YoY Change
Pretax Income	$192.8M	$534.0M	$86.30M
YoY Change	123.36%	44.03%	-15.97%
Income Tax	$40.44M	$121.2M	$18.50M
% Of Pretax Income	20.98%	22.69%	21.44%
Net Earnings	$152.3M	$412.9M	$67.62M
YoY Change	125.24%	47.71%	-21.47%
Net Earnings / Revenue	7.5%	6.13%	4.8%
Basic Earnings Per Share		$3.43	$0.57
Diluted Earnings Per Share	$1.245M	$3.38	$0.56
COMMON SHARES
Basic Shares Outstanding		120.3M shares
Diluted Shares Outstanding		122.0M shares

Balance Sheet

Concept	2021 Q3	2021	2020 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$497.7M	$497.7M	$542.1M
YoY Change	-8.18%	-8.18%	181.61%
Cash & Equivalents	$501.1M	$497.7M	$545.0M
Short-Term Investments
Other Short-Term Assets	$133.9M	$198.1M	$165.9M
YoY Change	-19.25%	19.42%	-7.38%
Inventory	$935.4M	$935.4M	$625.4M
Prepaid Expenses
Receivables	$1.106B	$1.106B	$880.7M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$2.737B	$2.737B	$2.214B
YoY Change	23.61%	23.61%	6.45%
LONG-TERM ASSETS
Property, Plant & Equipment	$1.566B	$1.678B	$1.571B
YoY Change	-0.31%	-0.46%	4.67%
Goodwill	$66.14M		$64.32M
YoY Change	2.82%		0.29%
Intangibles	$10.10M
YoY Change
Long-Term Investments
YoY Change
Other Assets	$259.5M	$147.3M	$232.2M
YoY Change	11.73%	40.67%	104.33%
Total Long-Term Assets	$1.902B	$1.902B	$1.868B
YoY Change	1.83%	1.83%	11.25%
TOTAL ASSETS
Total Short-Term Assets	$2.737B	$2.737B	$2.214B
Total Long-Term Assets	$1.902B	$1.902B	$1.868B
Total Assets	$4.639B	$4.639B	$4.082B
YoY Change	13.64%	13.65%	8.59%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$450.7M	$450.7M	$266.1M
YoY Change	69.38%	69.38%	-7.6%
Accrued Expenses	$475.4M	$451.4M	$461.0M
YoY Change	3.12%	5.11%	30.31%
Deferred Revenue	$23.95M		$25.45M
YoY Change	-5.9%		-31.52%
Short-Term Debt	$26.56M	$26.56M	$0.00
YoY Change			-100.0%
Long-Term Debt Due	$27.81M	$27.81M	$18.15M
YoY Change	53.21%	53.62%	34.44%
Total Short-Term Liabilities	$980.5M	$980.5M	$745.3M
YoY Change	31.56%	31.55%	7.3%
LONG-TERM LIABILITIES
Long-Term Debt	$1.015B	$1.015B	$1.066B
YoY Change	-4.7%	-4.7%	-13.18%
Other Long-Term Liabilities	$235.6M	$235.6M	$250.7M
YoY Change	-6.02%	-6.02%	87.63%
Total Long-Term Liabilities	$235.6M	$1.251B	$250.7M
YoY Change	-6.02%	-4.95%	87.63%
TOTAL LIABILITIES
Total Short-Term Liabilities	$980.5M	$980.5M	$745.3M
Total Long-Term Liabilities	$235.6M	$1.251B	$250.7M
Total Liabilities	$2.344B	$2.344B	$2.192B
YoY Change	6.9%	6.9%	2.7%
SHAREHOLDERS EQUITY
Retained Earnings	$2.163B		$1.808B
YoY Change	19.64%		14.03%
Common Stock	$369.4M		$360.2M
YoY Change	2.54%		0.07%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$152.6M		$175.1M
YoY Change	-12.84%		-11.29%
Treasury Stock Shares	8.474M shares		9.840M shares
Shareholders Equity	$2.295B	$2.295B	$1.889B
YoY Change
Total Liabilities & Shareholders Equity	$4.639B	$4.639B	$4.082B
YoY Change	13.64%	13.65%	8.59%

Cashflow Statement

Concept	2021 Q3	2021	2020 Q3
OPERATING ACTIVITIES
Net Income	$152.3M	$412.9M	$67.62M
YoY Change	125.24%	47.71%	-21.47%
Depreciation, Depletion And Amortization	$42.44M	$167.6M	$41.70M
YoY Change	1.77%	1.12%	1.46%
Cash From Operating Activities	$134.2M	$228.5M	$259.4M
YoY Change	-48.25%	-71.12%	1.53%
INVESTING ACTIVITIES
Capital Expenditures	-$56.77M	$184.2M	-$53.50M
YoY Change	6.11%	-1.84%	13.83%
Acquisitions		$1.888M
YoY Change		-89.59%
Other Investing Activities	-$1.354M	$2.500M	-$10.50M
YoY Change	-87.1%	-356.67%	-850.0%
Cash From Investing Activities	-$58.12M	-$162.1M	-$64.00M
YoY Change	-9.18%	-15.97%	40.35%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net		$368.5M
YoY Change		49.49%
Cash From Financing Activities	-21.23M	-$109.4M	-115.1M
YoY Change	-81.55%	-55.85%	-16.65%
NET CHANGE
Cash From Operating Activities	134.2M	$228.5M	259.4M
Cash From Investing Activities	-58.12M	-$162.1M	-64.00M
Cash From Financing Activities	-21.23M	-$109.4M	-115.1M
Net Change In Cash	54.89M	-$43.84M	80.30M
YoY Change	-31.65%	-112.48%	11.84%
FREE CASH FLOW
Cash From Operating Activities	$134.2M	$228.5M	$259.4M
Capital Expenditures	-$56.77M	$184.2M	-$53.50M
Free Cash Flow	$191.0M	$44.31M	$312.9M
YoY Change	-38.95%	-92.66%	3.44%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2021	dei	Entity Central Index Key EntityCentralIndexKey	0000022444
CY2021	dei	Amendment Flag AmendmentFlag	false
CY2021	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
CY2021	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2021Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	120590542	shares
CY2021Q1	cmc	Minimum Percentage Of Share Ownership Deemed Affiliates MinimumPercentageOfShareOwnershipDeemedAffiliates	0.10
CY2017Q3	us-gaap	Accounting Standards Update Extensible List AccountingStandardsUpdateExtensibleList	us-gaap:AccountingStandardsUpdate201802Member
CY2021Q3	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2021Q3	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2021Q3	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1
CY2020Q3	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
CY2021Q3	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
CY2020Q3	us-gaap	Operating Lease Liability Noncurrent Statement Of Financial Position Extensible List OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	us-gaap:OtherLiabilitiesNoncurrent
CY2021Q3	us-gaap	Operating Lease Liability Noncurrent Statement Of Financial Position Extensible List OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	us-gaap:OtherLiabilitiesNoncurrent
CY2020Q3	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	us-gaap:OtherAssetsNoncurrent
CY2021Q3	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	us-gaap:OtherAssetsNoncurrent
CY2020Q3	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	us-gaap:PropertyPlantAndEquipmentNet
CY2021Q3	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	us-gaap:PropertyPlantAndEquipmentNet
CY2021Q3	us-gaap	Finance Lease Liability Current Statement Of Financial Position Extensible List FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	us-gaap:LongTermDebtCurrent
CY2020Q3	us-gaap	Finance Lease Liability Current Statement Of Financial Position Extensible List FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	us-gaap:LongTermDebtCurrent
CY2021Q3	us-gaap	Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	us-gaap:LongTermDebtAndCapitalLeaseObligations
CY2020Q3	us-gaap	Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	us-gaap:LongTermDebtAndCapitalLeaseObligations
CY2021	dei	Document Type DocumentType	10-K
CY2021	dei	Document Annual Report DocumentAnnualReport	true
CY2021	dei	Document Period End Date DocumentPeriodEndDate	2021-08-31
CY2021	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--08-31
CY2021	dei	Document Transition Report DocumentTransitionReport	false
CY2021	dei	Entity File Number EntityFileNumber	1-4304
CY2021	dei	Entity Registrant Name EntityRegistrantName	Commercial Metals Company
CY2021	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2021	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	75-0725338
CY2021	dei	Entity Address Address Line1 EntityAddressAddressLine1	6565 N. MacArthur Blvd.
CY2021	dei	Entity Address City Or Town EntityAddressCityOrTown	Irving
CY2021	dei	Entity Address State Or Province EntityAddressStateOrProvince	TX
CY2021	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	75039
CY2021	dei	City Area Code CityAreaCode	214
CY2021	dei	Local Phone Number LocalPhoneNumber	689-4300
CY2021	dei	Security12b Title Security12bTitle	Common Stock, $0.01 par value
CY2021	dei	Trading Symbol TradingSymbol	CMC
CY2021	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2021	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2021	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2021	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2021	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2021	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2021	dei	Entity Small Business EntitySmallBusiness	false
CY2021	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2021	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2021	dei	Entity Shell Company EntityShellCompany	false
CY2021Q1	dei	Entity Public Float EntityPublicFloat	3000000000	USD
CY2021Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	120590542	shares
CY2021	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	6729760000	USD
CY2020	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	5476486000	USD
CY2019	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	5829002000	USD
CY2021	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	5623903000	USD
CY2020	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	4531688000	USD
CY2019	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	5025514000	USD
CY2021	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	496310000	USD
CY2020	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	502794000	USD
CY2019	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	463271000	USD
CY2021	us-gaap	Interest Expense InterestExpense	51904000	USD
CY2020	us-gaap	Interest Expense InterestExpense	61837000	USD
CY2019	us-gaap	Interest Expense InterestExpense	71373000	USD
CY2021	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-16841000	USD
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-1778000	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2021	cmc	Asset Impairment Charges From Continuing Operations AssetImpairmentChargesFromContinuingOperations	6784000	USD
CY2020	cmc	Asset Impairment Charges From Continuing Operations AssetImpairmentChargesFromContinuingOperations	7611000	USD
CY2019	cmc	Asset Impairment Charges From Continuing Operations AssetImpairmentChargesFromContinuingOperations	384000	USD
CY2021	us-gaap	Costs And Expenses CostsAndExpenses	6195742000	USD
CY2020	us-gaap	Costs And Expenses CostsAndExpenses	5105708000	USD
CY2019	us-gaap	Costs And Expenses CostsAndExpenses	5560542000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	534018000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	370778000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	268460000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	121153000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	92476000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	69681000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	412865000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	278302000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	198779000	USD
CY2021	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	0	USD
CY2020	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	1907000	USD
CY2019	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	-528000	USD
CY2021	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	0	USD
CY2020	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	706000	USD
CY2019	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	158000	USD
CY2021	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	0	USD
CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	1201000	USD
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-686000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	412865000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	279503000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	198093000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	3.43
CY2020	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.34
CY2019	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.69
CY2021	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0
CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.01
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-0.01
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.43
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.35
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.68
CY2021	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	3.38
CY2020	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.31
CY2019	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.67
CY2021	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0
CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.01
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.01
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.38
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.32
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.66
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	120338357	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	118921854	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	117834558	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	121983497	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	120309621	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	119124628	shares
CY2021	us-gaap	Net Income Loss NetIncomeLoss	412865000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	279503000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	198093000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-17747000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	33565000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-28861000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	35492000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-12136000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-6000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	2377000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	304000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	244000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	33115000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-12440000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-250000	USD
CY2021	cmc	Other Comprehensive Income Loss Defined Benefit Plan Gain Loss After Tax OtherComprehensiveIncomeLossDefinedBenefitPlanGainLossAfterTax	3523000	USD
CY2020	cmc	Other Comprehensive Income Loss Defined Benefit Plan Gain Loss After Tax OtherComprehensiveIncomeLossDefinedBenefitPlanGainLossAfterTax	-796000	USD
CY2019	cmc	Other Comprehensive Income Loss Defined Benefit Plan Gain Loss After Tax OtherComprehensiveIncomeLossDefinedBenefitPlanGainLossAfterTax	-2629000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Finalization Of Pension And Non Pension Postretirement Plan Valuation Net Of Tax OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax	53000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Finalization Of Pension And Non Pension Postretirement Plan Valuation Net Of Tax OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax	33000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Finalization Of Pension And Non Pension Postretirement Plan Valuation Net Of Tax OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax	1291000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-3576000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	763000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	1338000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	18944000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	20362000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-30449000	USD
CY2021	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	431809000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	299865000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	167644000	USD
CY2021Q3	us-gaap	Cash Cash Equivalents And Short Term Investments CashCashEquivalentsAndShortTermInvestments	497745000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents And Short Term Investments CashCashEquivalentsAndShortTermInvestments	542103000	USD
CY2021Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	5553000	USD
CY2020Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	9597000	USD
CY2021Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	1105580000	USD
CY2020Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	880728000	USD
CY2021Q3	us-gaap	Inventory Net InventoryNet	935387000	USD
CY2020Q3	us-gaap	Inventory Net InventoryNet	625393000	USD
CY2021Q3	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	173033000	USD
CY2020Q3	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	165879000	USD
CY2021Q3	us-gaap	Assets Held For Sale Not Part Of Disposal Group Current AssetsHeldForSaleNotPartOfDisposalGroupCurrent	25083000	USD
CY2020Q3	us-gaap	Assets Held For Sale Not Part Of Disposal Group Current AssetsHeldForSaleNotPartOfDisposalGroupCurrent	0	USD
CY2021Q3	us-gaap	Assets Current AssetsCurrent	2736828000	USD
CY2020Q3	us-gaap	Assets Current AssetsCurrent	2214103000	USD
CY2021Q3	us-gaap	Land Land	123135000	USD
CY2020Q3	us-gaap	Land Land	143567000	USD
CY2021Q3	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	792915000	USD
CY2020Q3	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	786820000	USD
CY2021Q3	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	2435541000	USD
CY2020Q3	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	2364923000	USD
CY2021Q3	us-gaap	Construction In Progress Gross ConstructionInProgressGross	147166000	USD
CY2020Q3	us-gaap	Construction In Progress Gross ConstructionInProgressGross	103776000	USD
CY2021Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	3498757000	USD
CY2020Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	3399086000	USD
CY2021Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1932634000	USD
CY2020Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1828019000	USD
CY2021Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1566123000	USD
CY2020Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1571067000	USD
CY2021Q3	us-gaap	Goodwill Goodwill	66137000	USD
CY2020Q3	us-gaap	Goodwill Goodwill	64321000	USD
CY2021Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	235607000	USD
CY2021Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	269583000	USD
CY2020Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	232237000	USD
CY2021Q3	us-gaap	Assets Assets	4638671000	USD
CY2020Q3	us-gaap	Assets Assets	4081728000	USD
CY2021Q3	us-gaap	Accounts Payable Trade Current AccountsPayableTradeCurrent	450723000	USD
CY2020Q3	us-gaap	Accounts Payable Trade Current AccountsPayableTradeCurrent	266102000	USD
CY2021Q3	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	475384000	USD
CY2020Q3	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	454977000	USD
CY2021Q3	cmc	Business Combination Acquired Unfavorable Contract Backlog Net Carrying Amount BusinessCombinationAcquiredUnfavorableContractBacklogNetCarryingAmount	0	USD
CY2020Q3	cmc	Business Combination Acquired Unfavorable Contract Backlog Net Carrying Amount BusinessCombinationAcquiredUnfavorableContractBacklogNetCarryingAmount	6035000	USD
CY2021Q3	us-gaap	Long Term Debt Current LongTermDebtCurrent	27806000	USD
CY2020Q3	us-gaap	Long Term Debt Current LongTermDebtCurrent	18149000	USD
CY2021Q3	us-gaap	Liabilities Current LiabilitiesCurrent	980473000	USD
CY2020Q3	us-gaap	Liabilities Current LiabilitiesCurrent	745263000	USD
CY2021Q3	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	112067000	USD
CY2020Q3	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	130810000	USD
CY2020Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	250706000	USD
CY2021Q3	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	1015415000	USD
CY2020Q3	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	1065536000	USD
CY2021Q3	us-gaap	Liabilities Liabilities	2343562000	USD
CY2020Q3	us-gaap	Liabilities Liabilities	2192315000	USD
CY2021Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2021Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2020Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2021Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	200000000	shares
CY2020Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	200000000	shares
CY2021Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	129060664	shares
CY2020Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	129060664	shares
CY2021Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	120586589	shares
CY2020Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	119220905	shares
CY2021Q3	us-gaap	Common Stock Value CommonStockValue	1290000	USD
CY2020Q3	us-gaap	Common Stock Value CommonStockValue	1290000	USD
CY2021Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	368064000	USD
CY2020Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	358912000	USD
CY2021Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-84820000	USD
CY2020Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-103764000	USD
CY2021Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2162925000	USD
CY2020Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1807826000	USD
CY2021Q3	us-gaap	Treasury Stock Shares TreasuryStockShares	8474075	shares
CY2020Q3	us-gaap	Treasury Stock Shares TreasuryStockShares	9839759	shares
CY2021Q3	us-gaap	Treasury Stock Value TreasuryStockValue	152582000	USD
CY2020Q3	us-gaap	Treasury Stock Value TreasuryStockValue	175063000	USD
CY2021Q3	us-gaap	Stockholders Equity StockholdersEquity	2294877000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	1889201000	USD
CY2021Q3	us-gaap	Minority Interest MinorityInterest	232000	USD
CY2020Q3	us-gaap	Minority Interest MinorityInterest	212000	USD
CY2021Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2295109000	USD
CY2020Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1889413000	USD
CY2021Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	4638671000	USD
CY2020Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	4081728000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	412865000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	279503000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	198093000	USD
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	167613000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	165758000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	158671000	USD
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	43677000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	31850000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	25106000	USD
CY2021	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-39873000	USD
CY2020	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	49580000	USD
CY2019	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	49523000	USD
CY2021	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-16841000	USD
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-1778000	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2021	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	8807000	USD
CY2020	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	4213000	USD
CY2019	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	2281000	USD
CY2021	us-gaap	Asset Impairment Charges AssetImpairmentCharges	6784000	USD
CY2020	us-gaap	Asset Impairment Charges AssetImpairmentCharges	7611000	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	384000	USD
CY2021	cmc	Amortization Acquired Unfavorable Contract Backlog AmortizationAcquiredUnfavorableContractBacklog	6035000	USD
CY2020	cmc	Amortization Acquired Unfavorable Contract Backlog AmortizationAcquiredUnfavorableContractBacklog	29367000	USD
CY2019	cmc	Amortization Acquired Unfavorable Contract Backlog AmortizationAcquiredUnfavorableContractBacklog	74784000	USD
CY2021	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	541000	USD
CY2020	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	2643000	USD
CY2019	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	1111000	USD
CY2021	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	228026000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-146375000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-27204000	USD
CY2021	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	316316000	USD
CY2020	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-78903000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-89664000	USD
CY2021	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	194801000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	45718000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-15315000	USD
CY2021	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	15591000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-15065000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	52851000	USD
CY2021	us-gaap	Increase Decrease In Accounts Receivable From Securitization IncreaseDecreaseInAccountsReceivableFromSecuritization	0	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable From Securitization IncreaseDecreaseInAccountsReceivableFromSecuritization	0	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable From Securitization IncreaseDecreaseInAccountsReceivableFromSecuritization	367521000	USD
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	228474000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	791204000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	37004000	USD
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	184165000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	187618000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	138836000	USD
CY2021	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	26424000	USD
CY2020	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	11843000	USD
CY2019	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	3910000	USD
CY2021	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	1888000	USD
CY2020	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	18137000	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	700941000	USD
CY2021	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	2500000	USD
CY2020	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-974000	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-6298000	USD
CY2021	cmc	Increase Decreasein Accounts Receivablefrom Securitization Investing Activities IncreaseDecreaseinAccountsReceivablefromSecuritizationInvestingActivities	0	USD
CY2020	cmc	Increase Decreasein Accounts Receivablefrom Securitization Investing Activities IncreaseDecreaseinAccountsReceivablefromSecuritizationInvestingActivities	0	USD
CY2019	cmc	Increase Decreasein Accounts Receivablefrom Securitization Investing Activities IncreaseDecreaseinAccountsReceivablefromSecuritizationInvestingActivities	-367521000	USD
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-162129000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-192938000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-462048000	USD
CY2021	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	309279000	USD
CY2020	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	62539000	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	180000000	USD
CY2021	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	368527000	USD
CY2020	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	246523000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	127704000	USD
CY2021	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	296586000	USD
CY2020	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	234482000	USD
CY2019	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	288896000	USD
CY2021	cmc	Repayments Under Accounts Receivable Programs Financing Activities RepaymentsUnderAccountsReceivableProgramsFinancingActivities	269858000	USD
CY2020	cmc	Repayments Under Accounts Receivable Programs Financing Activities RepaymentsUnderAccountsReceivableProgramsFinancingActivities	237828000	USD
CY2019	cmc	Repayments Under Accounts Receivable Programs Financing Activities RepaymentsUnderAccountsReceivableProgramsFinancingActivities	296033000	USD
CY2021	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	57766000	USD
CY2020	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	57056000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	56537000	USD
CY2021	cmc	Proceeds Paymentsfrom Issuanceof Sharesunder Incentiveand Sharebased Compensation Plans Including Tax Withholdings ProceedsPaymentsfromIssuanceofSharesunderIncentiveandSharebasedCompensationPlansIncludingTaxWithholdings	-3166000	USD
CY2020	cmc	Proceeds Paymentsfrom Issuanceof Sharesunder Incentiveand Sharebased Compensation Plans Including Tax Withholdings ProceedsPaymentsfromIssuanceofSharesunderIncentiveandSharebasedCompensationPlansIncludingTaxWithholdings	-3420000	USD
CY2019	cmc	Proceeds Paymentsfrom Issuanceof Sharesunder Incentiveand Sharebased Compensation Plans Including Tax Withholdings ProceedsPaymentsfromIssuanceofSharesunderIncentiveandSharebasedCompensationPlansIncludingTaxWithholdings	-1876000	USD
CY2021	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	13128000	USD
CY2020	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	0	USD
CY2019	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	0	USD
CY2021	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	2830000	USD
CY2020	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2021	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	20000	USD
CY2020	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	16000	USD
CY2019	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	10000	USD
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-109390000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-247790000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-13244000	USD
CY2021	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-790000	USD
CY2020	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	759000	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-598000	USD
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-43835000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	351235000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-438886000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	544964000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	193729000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	632615000	USD
CY2021Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	501129000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	544964000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	193729000	USD
CY2021	us-gaap	Income Taxes Paid IncomeTaxesPaid	140950000	USD
CY2020	us-gaap	Income Taxes Paid IncomeTaxesPaid	44499000	USD
CY2019	us-gaap	Income Taxes Paid IncomeTaxesPaid	7977000	USD
CY2021	us-gaap	Interest Paid Net InterestPaidNet	58325000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	59711000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	65190000	USD
CY2021	cmc	Capital Lease Obligations Incurredandchangesinaccountspayablesrelatedtopropertyplantandequipment CapitalLeaseObligationsIncurredandchangesinaccountspayablesrelatedtopropertyplantandequipment	39899000	USD
CY2020	cmc	Capital Lease Obligations Incurredandchangesinaccountspayablesrelatedtopropertyplantandequipment CapitalLeaseObligationsIncurredandchangesinaccountspayablesrelatedtopropertyplantandequipment	25100000	USD
CY2019	cmc	Capital Lease Obligations Incurredandchangesinaccountspayablesrelatedtopropertyplantandequipment CapitalLeaseObligationsIncurredandchangesinaccountspayablesrelatedtopropertyplantandequipment	57640000	USD
CY2021Q3	us-gaap	Cash Cash Equivalents And Short Term Investments CashCashEquivalentsAndShortTermInvestments	497745000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents And Short Term Investments CashCashEquivalentsAndShortTermInvestments	542103000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents And Short Term Investments CashCashEquivalentsAndShortTermInvestments	192461000	USD
CY2021Q3	us-gaap	Restricted Cash RestrictedCash	3384000	USD
CY2020Q3	us-gaap	Restricted Cash RestrictedCash	2861000	USD
CY2019Q3	us-gaap	Restricted Cash RestrictedCash	1268000	USD
CY2021Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	501129000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	544964000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	193729000	USD
CY2018Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1493583000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	198093000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-30449000	USD
CY2019	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.48
CY2019	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	56537000	USD
CY2019	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-1875000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	21052000	USD
CY2019	us-gaap	Proceeds From Payments To Minority Shareholders ProceedsFromPaymentsToMinorityShareholders	10000	USD
CY2017Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-2747000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Restricted Stock Units Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition	2927000	USD
CY2019Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1624057000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	279503000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	20362000	USD
CY2020	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.48
CY2020	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	57056000	USD
CY2020	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-3420000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	23441000	USD
CY2020	us-gaap	Proceeds From Payments To Minority Shareholders ProceedsFromPaymentsToMinorityShareholders	16000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Restricted Stock Units Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition	2510000	USD
CY2020Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1889413000	USD
CY2021	us-gaap	Profit Loss ProfitLoss	412865000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	18944000	USD
CY2021	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.48
CY2021	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	57766000	USD
CY2021	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-3166000	USD
CY2021	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	29380000	USD
CY2021	us-gaap	Proceeds From Payments To Minority Shareholders ProceedsFromPaymentsToMinorityShareholders	20000	USD
CY2021	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Restricted Stock Units Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition	5419000	USD
CY2021Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2295109000	USD
CY2021	us-gaap	Nature Of Operations NatureOfOperations	<div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">NOTE 1. NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES </span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Nature of Operations</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%"> </span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Commercial Metals Company ("CMC") and its subsidiaries (collectively, the "Company," "we," "our" or "us") manufacture, recycle and fabricate steel and metal products and provide related materials and services through a network of facilities that includes seven electric arc furnace ("EAF") mini mills, two EAF micro mills, one rerolling mill, steel fabrication and processing plants, construction-related product warehouses and metal recycling facilities in the United States ("U.S.") and Poland.</span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="background-color:#ffffff;color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Company has two reportable segments: North America and Europe.</span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="background-color:#ffffff;color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">North America</span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The North America segment is a vertically integrated network of recycling facilities, steel mills and fabrication operations located in the U.S. The recycling facilities process ferrous and nonferrous scrap metals (collectively known as "raw materials") for use by manufacturers of new metal products. The steel mills manufacture finished long steel products including reinforcing bar ("rebar"), merchant bar, light structural and other special sections as well as semi-finished billets for rerolling and forging applications (collectively known as "steel products"). The fabrication operations primarily manufacture fabricated rebar and steel fence posts (collectively known as "downstream products"). The strategy in North America is to optimize the Company's vertically integrated value chain to maximize profitability by obtaining the lowest possible input costs and highest possible selling prices. The Company operates the recycling facilities to provide low-cost scrap to the steel mills and the fabrication operations to optimize the steel mill volumes. The North America segment's products are sold primarily to steel mills and foundries, construction, fabrication and other manufacturing industries. </span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="background-color:#ffffff;color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Europe</span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Europe segment is a vertically integrated network of recycling facilities, an EAF mini mill and fabrication operations located in Poland. The steel products manufactured by this segment include rebar, merchant bar and wire rod as well as semi-finished billets. In addition, the downstream products manufactured by this segment's fabrication operations include fabricated rebar, fabricated mesh, assembled rebar cages and other fabricated rebar by-products. The Europe segment's products are sold primarily to fabricators, manufacturers, distributors and construction companies. </span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Summary of Significant Accounting Policies</span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Consolidation</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%"> </span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The consolidated financial statements include the accounts of the Company and its wholly-owned and majority owned subsidiaries and certain variable interest entities ("VIEs") for which the Company is the primary beneficiary. Intercompany account balances and transactions have been eliminated.</span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Use of Estimates</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%"> </span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The preparation of the Company's consolidated financial statements in accordance with accounting principles generally accepted in the United States ("GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and reported amounts of net sales and expenses during the reporting period. Significant items subject to such estimates and assumptions include revenue recognition, income taxes, carrying value of inventory, acquisitions, goodwill, long-lived assets and contingencies. Actual results could differ significantly from these estimates and assumptions.</span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Cash and Cash Equivalents</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%"> </span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Cash and cash equivalents include cash on deposit and short-term, highly-liquid investments with original maturities of three months or less at the date of purchase. </span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Revenue Recognition and Allowance for Doubtful Accounts</span></div><div style="text-align:justify"><span><br/></span></div><div style="margin-bottom:8pt;text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Revenue is recognized when control of the promised goods or services is transferred to the customer in an amount that reflects the consideration received or expected to be received in exchange for those goods or services. The Company's performance obligations arise from (i) sales of raw materials, steel products and downstream products and (ii) installation services performed by its fabrication operations. The shipment of products to customers is considered a fulfillment activity and amounts billed to customers for shipping and freight are included in net sales, and the related costs are included in cost of goods sold. Net sales are presented net of taxes. </span><span style="background-color:#ffffff;color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">R</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">evenue related to raw materials and steel products in the North America and Europe segments and downstream products in the Europe segment is recognized at a point in time concurrent with the transfer of control, which usually occurs, depending on shipping terms, upon shipment or customer receipt. Revenue related to steel fence posts and other downstream products in the North America segment not discussed below is recognized equal to billing under an available practical expedient. </span></div><div style="margin-bottom:8pt;text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Each fabricated rebar contract sold by the North America segment represents a single performance obligation and revenue is recognized over time. For contracts where the Company provides fabricated rebar and installation services, revenue is recognized over time using an input measure of progress based on contract costs incurred to date compared to total estimated contract costs ("input measure"). This input measure provides a reasonable depiction of the Company’s progress towards satisfaction of the performance obligation as there is a direct relationship between costs incurred by the Company and the transfer of the fabricated rebar and installation services. Revenue from fabricated rebar contracts where the Company does not provide installation services is recognized over time using an output measure of progress based on tons shipped compared to total estimated tons ("output measure"). This output measure provides a reasonable depiction of the transfer of contract value to the customer, as there is a direct relationship between the units shipped by the Company and the transfer of the fabricated rebar. If total estimated costs on any contract are greater than the net contract revenues, the Company recognizes the entire estimated loss in the period the loss becomes known. The cumulative effect of revisions to estimates related to net contract revenues, costs to complete or total planned quantity is recorded in the period in which such revisions are identified.</span></div><div style="margin-bottom:8pt;text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The timing of revenue recognition may differ from the timing of invoicing to customers. The Company records an asset when revenue is recognized prior to invoicing and a liability when revenue is recognized subsequent to invoicing. Payment terms and conditions vary by contract type, although the Company generally requires customers to pay 30 days after the Company satisfies the performance obligations. In instances where the timing of revenue recognition differs from the timing of invoicing, the Company has determined the contracts do not include a significant financing component.</span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Company maintains an allowance for doubtful accounts for the accounts receivable we estimate will not be collected based on market conditions, customers' financial condition and other factors. Historically, these allowances have not been material. The Company reviews and sets credit limits for each customer. The Europe segment uses credit insurance to ensure payment in accordance with the terms of sale. Generally, collateral is not required. Approximately 17% and 13% of total receivables at August 31, 2021 and 2020, respectively, were secured by credit insurance.</span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Inventories</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%"> </span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Inventories are stated at the lower of cost or net realizable value. Cost is determined by the weighted average cost method.</span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Elements of cost in finished goods inventory in addition to the cost of material include depreciation, amortization, utilities, consumable production inputs, maintenance, production, wages and transportation costs. Additionally, the costs of departments that support production, including materials management and quality control, are allocated to inventory.</span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Property, Plant and Equipment </span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Property, plant and equipment are recorded at cost. Maintenance is expensed as incurred. Leasehold improvements are amortized over the shorter of their estimated useful lives or the lease term. Depreciation and amortization is recorded on a straight-line basis over the following estimated useful lives:</span></div><div style="text-align:justify"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:99.707%"><tr><td style="width:1.0%"/><td style="width:74.706%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:4.911%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:4.618%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:4.765%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:5.500%"/><td style="width:0.1%"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Buildings</span></td><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">7</span></td><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"> to</span></td><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">40</span></td><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"> years</span></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Land improvements</span></td><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">3</span></td><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"> to</span></td><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">25</span></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"> years</span></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Leasehold improvements</span></td><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">3</span></td><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"> to</span></td><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">15</span></td><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"> years</span></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Equipment</span></td><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">3</span></td><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"> to</span></td><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">25</span></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"> years</span></td></tr></table></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Company evaluates impairment of its property, plant and equipment whenever events or changes in circumstances indicate that the carrying value may not be recoverable. For each asset or group of assets held for use with indicators of impairment, the </span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Company compares the sum of the estimated future cash flows generated by the asset or group of assets with its associated net carrying value. If the net carrying value of the asset or group of assets exceeds estimated undiscounted future cash flows, the excess of the net carrying value over estimated fair value is charged to impairment loss. Properties held for sale are reported at the lower of their carrying amount or their estimated sales price, less estimated costs to sell.</span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Leases</span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Company's leases are primarily for real property and equipment. The Company determines if an arrangement is a lease at inception of a contract if the terms state the Company has the right to direct the use of, and obtain substantially all the economic benefits from, a specific asset identified in the contract. The right-of-use ("ROU") assets represent the Company's right to use the underlying assets for the lease term, and the lease liabilities represent the obligation to make lease payments arising from the leases. The Company records its ROU assets in other noncurrent assets, its current lease liabilities in accrued expenses and other payables and its noncurrent lease liabilities in other noncurrent liabilities. ROU assets and lease liabilities are recognized at commencement date based on the present value of lease payments to be made over the lease term. Certain of the Company's lease agreements contain options to extend the lease. The Company evaluates these options on a lease-by-lease basis, and if the Company determines it is reasonably certain to be exercised, the lease term includes the extension. The Company uses its incremental borrowing rate at lease commencement to determine the present value of lease payments, and lease expense is recognized on a straight-line basis over the lease term. The incremental borrowing rate is the rate of interest the Company could borrow on a collateralized basis over a similar term with similar payments. The Company does not record leases with an initial term of twelve months or less (“short-term leases”).</span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Certain of the Company's lease agreements include payments for certain variable costs not determinable upon lease commencement, including mileage, utilities, fuel and inflation adjustments. These variable lease payments are recognized in cost of goods sold and selling, general and administrative expenses, but are not included in the ROU asset or lease liability balances. The Company's lease agreements do not contain any material residual value guarantees, restrictions or covenants.</span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Government Assistance</span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Government assistance, including non-monetary grants, herein collectively referred to as grants, are not recognized until there is reasonable assurance that the Company will comply with the conditions of the grant and the Company will receive the grant.</span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Generally, government grants fall into two categories: grants related to assets and grants related to income. Grants related to assets are government grants for the purchase, construction or other acquisition of long-lived assets. The Company accounts for grants related to assets as deferred income with the offset to an asset account, such as fixed assets, on the consolidated balance sheets. Non-monetary grants are recognized at fair value. The Company recognizes the deferred income on grants related to depreciable assets in profit or loss on a systematic basis over the useful life of the asset, which, consistent with the Company's fixed assets policy, is straight-line. The period over which grants are recognized depends on the terms of the agreement. Grants related to specific expenses already incurred are recognized in profit or loss in the period in which the grant becomes receivable. Grants related to non-depreciable assets may require the fulfillment of certain obligations. In such cases, these grants are recognized in profit or loss over the periods that bear the cost of meeting the obligations.</span></div><div><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Grants related to income are any grants that are not considered grants related to assets, such as grants to compensate for certain expenses. Grants related to income are recognized as a reduction in the related expense in the period that the recognition criteria are met. See Note 9, New Markets Tax Credit Transactions.</span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Goodwill and Other Intangible Assets</span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Goodwill is tested for impairment at the reporting unit level annually and whenever events or circumstances indicate that the carrying value may not be recoverable.</span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">To evaluate goodwill for impairment, the Company utilizes a quantitative test that compares the fair value of a reporting unit with its carrying amount, including goodwill. If the carrying amount of a reporting unit exceeds its fair value, an impairment loss is indicated in the amount that the carrying value exceeds the fair value of the reporting unit, not to exceed the goodwill value for the reporting unit. The Company's reporting units represent an operating segment or one level below an operating segment.</span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Company estimates the fair value of its reporting units using a weighting of fair values derived from the income and market approaches. Under the income approach, the Company determines the fair value of a reporting unit based on the present value of estimated future cash flows. Cash flow projections are based on management's estimates of revenue growth rates and </span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">operating margins, taking into account industry and market conditions. The discount rate is based on a weighted average cost of capital adjusted for the relevant risk associated with the characteristics of the reporting unit. The market approach estimates fair value based on market multiples of earnings derived from comparable publicly-traded companies with similar operating and investment characteristics as the reporting unit. See Note 6, Goodwill and Other Intangible Assets, for additional information on the Company's annual goodwill impairment analysis. </span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Intangible assets with finite lives are amortized on a straight-line basis over their estimated useful lives and are reviewed for impairment whenever events or changes in circumstances indicate that the carrying value may not be recoverable. Impairment charges are recorded on finite-lived intangible assets when indicators of impairment are present and the undiscounted cash flows estimated to be generated by those assets are less than the assets' carrying amounts. </span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Contingencies</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%"> </span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Company accrues for claims and litigation, including environmental investigation and remediation costs, when they are both probable and the amount can be reasonably estimated. Environmental costs are based upon estimates regarding the sites for which the Company will be responsible, the scope and cost of work to be performed at each site, the portion of costs that will be shared with other parties and the timing of remediation. Where timing and amounts cannot be reasonably determined, a range is estimated and the lower end of the range is recorded.</span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Stock-Based Compensation</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%"> </span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Company recognizes stock-based equity and liability awards at fair value. The fair value of each stock-based equity award is estimated at the grant date using the Black-Scholes or Monte Carlo pricing model. Total compensation cost of the stock-based equity award is amortized over the requisite service period using the accelerated method of amortization for grants with graded vesting or the straight-line method for grants with cliff vesting. Stock-based liability awards are measured at fair value at the end of each reporting period and will fluctuate based on the price of CMC common stock and performance relative to the targets. </span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Income Taxes</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%"> </span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">CMC and its U.S. subsidiaries file a consolidated federal income tax return. Deferred income taxes are provided for temporary differences between financial statement and income tax bases of assets and liabilities. The principal differences are described in Note 12, Income Tax. Benefits from income tax credits are reflected currently in earnings. The Company records income tax positions based on a more likely than not threshold that the tax positions will be sustained on examination by the taxing authorities having full knowledge of all relevant information. The Company classifies interest and any statutory penalties recognized on a tax position as income tax expense.</span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Foreign Currencies</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%"> </span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The functional currency of the Company's Polish operations is the local currency, the Polish zloty ("PLN"). Translation adjustments are reported as a component of accumulated other comprehensive income or loss. </span><span style="background-color:#ffffff;color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Transaction gains (losses) from transactions denominated in currencies other than the functional currency related to continuing operations were immaterial for 2021, 2020 and 2019. </span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Derivative Financial Instruments</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%"> </span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Company recognizes derivatives as either assets or liabilities in the consolidated balance sheets and measures those instruments at fair value. Derivatives that are not designated as hedges are adjusted to fair value through net earnings. Changes in the fair value of derivatives that are designated as hedges are recognized depending on the nature of the hedge. In the case of fair value hedges, changes are recognized as an offset against the change in fair value of the hedged balance sheet item. When the derivative is designated as a cash flow hedge and is highly effective, changes are recognized in other comprehensive income. </span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">When a derivative instrument is sold, terminated, exercised or expires, the gain or loss is recorded in the consolidated statement of earnings for fair value hedges, and the cumulative unrealized gain or loss, which had been recognized in the statement of comprehensive income, is reclassified to the consolidated statement of earnings for cash flow hedges. Additionally, when hedged items are sold or extinguished, or the anticipated transaction being hedged is no longer expected to occur, the Company recognizes the gain or loss on the designated hedged financial instrument.</span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Fair Value </span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Company has established a fair value hierarchy which prioritizes the inputs to the valuation techniques used to measure fair value into three levels. These levels are determined based on the lowest level input that is significant to the fair value measurement. Level 1 represents unadjusted quoted prices in active markets for identical assets and liabilities. Level 2 represents quoted prices for similar assets and liabilities in active markets (other than those included in Level 1) which are observable, either directly or indirectly. Level 3 represents valuations derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable.</span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Recently Adopted Accounting Pronouncements </span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">On September 1, 2019, the Company adopted Accounting Standards Update (“ASU”) 2016-02, Leases (Topic 842), as amended, (“ASU 2016-02”), using the modified retrospective transition approach. ASU 2016-02 requires a lessee to recognize an ROU asset and a lease liability on its balance sheet for all leases with terms longer than twelve months. The Company’s financial statements for periods prior to September 1, 2019 were not modified for the application of this ASU. Upon adoption of ASU 2016-02, the Company recorded the following amounts associated with operating leases in its consolidated balance sheet at September 1, 2019: $113.4 million of ROU assets in other noncurrent assets, $30.9 million of lease liabilities in accrued expenses and other payables and $84.9 million of lease liabilities in other noncurrent liabilities. There was no impact to the opening balance of retained earnings as a result of implementing ASU 2016-02. The Company elected the package of three practical expedients available under the ASU. Additionally, the Company implemented appropriate changes to internal processes and controls to support recognition, subsequent measurement and disclosures.</span></div>
CY2021Q3	cmc	Numberof Electric Arc Furnace Mini Mills NumberofElectricArcFurnaceMiniMills	7	mini_mill
CY2021Q3	cmc	Numberof Electric Arc Furnace Micro Mills NumberofElectricArcFurnaceMicroMills	2	micro_mill
CY2021Q3	cmc	Number Of Rerolling Mills NumberOfRerollingMills	1	numberOfRerollingMills
CY2021	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	2	segments
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2100000	USD
CY2018Q4	cmc	Numberof Rebar Fabrication Facilities NumberofRebarFabricationFacilities	33	fabrication_facility
CY2018Q4	cmc	Numberof Electric Arc Furnace Mini Mills NumberofElectricArcFurnaceMiniMills	4	mini_mill
CY2018Q4	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	701200000	USD
CY2020	cmc	Business Acquisition Working Capital Adjustment BusinessAcquisitionWorkingCapitalAdjustment	32100000	USD
CY2021	us-gaap	Business Combination Pro Forma Information Revenue Of Acquiree Since Acquisition Date Actual BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual	1400000000	USD
CY2021	us-gaap	Business Combination Pro Forma Information Earnings Or Loss Of Acquiree Since Acquisition Date Actual BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual	132700000	USD
CY2020	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	6033908000	USD
CY2020	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	162255000	USD
CY2021	us-gaap	Restructuring And Related Cost Incurred Cost RestructuringAndRelatedCostIncurredCost	13800000	USD
CY2020	us-gaap	Restructuring And Related Cost Incurred Cost RestructuringAndRelatedCostIncurredCost	9800000	USD
CY2021Q3	us-gaap	Assets Held For Sale Not Part Of Disposal Group AssetsHeldForSaleNotPartOfDisposalGroup	24900000	USD
CY2021	us-gaap	Proceeds From Sale Of Machinery And Equipment ProceedsFromSaleOfMachineryAndEquipment	300000000	USD
CY2021	cmc	Number Of Facilities Idled NumberOfFacilitiesIdled	6	location
CY2020	us-gaap	Severance Costs1 SeveranceCosts1	6200000	USD
CY2018Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-93677000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Before Reclassifications Before Tax OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax	-33071000	USD
CY2019	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax	-2222000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-400000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-30449000	USD
CY2019Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-124126000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Before Reclassifications Before Tax OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax	17624000	USD
CY2020	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax	369000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-3107000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	20362000	USD
CY2020Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-103764000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Before Reclassifications Before Tax OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax	29008000	USD
CY2021	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax	2826000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	7238000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	18944000	USD
CY2021Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-84820000	USD
CY2021Q3	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	64168000	USD
CY2020Q3	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	53275000	USD
CY2021Q3	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	23948000	USD
CY2020Q3	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	25450000	USD
CY2021Q3	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	799300000	USD
CY2021Q3	us-gaap	Revenue Remaining Performance Obligation Percentage RevenueRemainingPerformanceObligationPercentage	0.70
CY2021Q3	us-gaap	Inventory Raw Materials InventoryRawMaterials	286100000	USD
CY2020Q3	us-gaap	Inventory Raw Materials InventoryRawMaterials	123900000	USD
CY2019Q3	us-gaap	Goodwill Gross GoodwillGross	74325000	USD
CY2020	us-gaap	Goodwill Period Increase Decrease GoodwillPeriodIncreaseDecrease	195000	USD
CY2020Q3	us-gaap	Goodwill Gross GoodwillGross	74520000	USD
CY2021	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	1909000	USD
CY2021	us-gaap	Goodwill Period Increase Decrease GoodwillPeriodIncreaseDecrease	-98000	USD
CY2021Q3	us-gaap	Goodwill Gross GoodwillGross	76331000	USD
CY2019Q3	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	10187000	USD
CY2020	cmc	Goodwill Impairment Foreign Currency Translation GoodwillImpairmentForeignCurrencyTranslation	-12000	USD
CY2020Q3	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	10199000	USD
CY2021	cmc	Goodwill Impairment Foreign Currency Translation GoodwillImpairmentForeignCurrencyTranslation	5000	USD
CY2021Q3	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	10194000	USD
CY2019Q3	us-gaap	Goodwill Goodwill	64138000	USD
CY2020	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	183000	USD
CY2020Q3	us-gaap	Goodwill Goodwill	64321000	USD
CY2021	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	1909000	USD
CY2021	cmc	Amortization Acquired Unfavorable Contract Backlog AmortizationAcquiredUnfavorableContractBacklog	6000000	USD
CY2020	cmc	Amortization Acquired Unfavorable Contract Backlog AmortizationAcquiredUnfavorableContractBacklog	29400000	USD
CY2019	cmc	Amortization Acquired Unfavorable Contract Backlog AmortizationAcquiredUnfavorableContractBacklog	74800000	USD
CY2021	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	-93000	USD
CY2021Q3	us-gaap	Goodwill Goodwill	66137000	USD
CY2020	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2021	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	21666000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	11565000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	10101000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	22069000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	9421000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	12648000	USD
CY2020Q3	cmc	Business Combination Acquired Unfavorable Contract Backlog Liability BusinessCombinationAcquiredUnfavorableContractBacklogLiability	110200000	USD
CY2020Q3	cmc	Business Combination Acquired Unfavorable Contract Backlog Net Carrying Amount BusinessCombinationAcquiredUnfavorableContractBacklogNetCarryingAmount	6000000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2200000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2200000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	1928000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	1473000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	1436000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	1078000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	153000	USD
CY2021Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	112202000	USD
CY2020Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	114905000	USD
CY2021Q3	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	55308000	USD
CY2020Q3	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	50642000	USD
CY2021Q3	cmc	Right Of Use Asset RightOfUseAsset	167510000	USD
CY2020Q3	cmc	Right Of Use Asset RightOfUseAsset	165547000	USD
CY2021Q3	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	26433000	USD
CY2020Q3	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	27604000	USD
CY2021Q3	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	93409000	USD
CY2020Q3	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	95810000	USD
CY2021Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	119842000	USD
CY2020Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	123414000	USD
CY2021Q3	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	16040000	USD
CY2020Q3	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	14373000	USD
CY2021Q3	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	36104000	USD
CY2020Q3	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	35851000	USD
CY2021Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	52144000	USD
CY2020Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	50224000	USD
CY2021Q3	cmc	Lease Liability LeaseLiability	171986000	USD
CY2020Q3	cmc	Lease Liability LeaseLiability	173638000	USD
CY2021	us-gaap	Operating Lease Cost OperatingLeaseCost	32752000	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	35611000	USD
CY2021	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	13050000	USD
CY2020	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	11445000	USD
CY2021	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	2213000	USD
CY2020	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	1792000	USD
CY2021	cmc	Finance Lease Cost FinanceLeaseCost	15263000	USD
CY2020	cmc	Finance Lease Cost FinanceLeaseCost	13237000	USD
CY2021	cmc	Variable And Short Term Lease Cost VariableAndShortTermLeaseCost	20096000	USD
CY2020	cmc	Variable And Short Term Lease Cost VariableAndShortTermLeaseCost	17020000	USD
CY2021	us-gaap	Lease Cost LeaseCost	68111000	USD
CY2020	us-gaap	Lease Cost LeaseCost	65868000	USD
CY2021Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P6Y2M12D
CY2020Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P6Y3M18D
CY2021Q3	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P3Y7M6D
CY2020Q3	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P3Y9M18D
CY2021Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.04451
CY2020Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.04283
CY2021Q3	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.04079
CY2020Q3	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.04270
CY2021	us-gaap	Operating Lease Payments OperatingLeasePayments	31686000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	36063000	USD
CY2021	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	2228000	USD
CY2020	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	1720000	USD
CY2021	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	16016000	USD
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	12774000	USD
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	25888000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	43642000	USD
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	18006000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	26573000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	31555000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	17853000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	26726000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	15632000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	21040000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	12859000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	16308000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	7256000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	12106000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	1854000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	30826000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	615000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	138561000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	56069000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	18719000	USD
CY2021Q3	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	3925000	USD
CY2021Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	119842000	USD
CY2021Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	52144000	USD
CY2021Q3	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	1077922000	USD
CY2020Q3	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	1092266000	USD
CY2021Q3	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	8141000	USD
CY2020Q3	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	8581000	USD
CY2021Q3	cmc	Longterm Debtand Capital Lease Obligations Net LongtermDebtandCapitalLeaseObligationsNet	1069781000	USD
CY2020Q3	cmc	Longterm Debtand Capital Lease Obligations Net LongtermDebtandCapitalLeaseObligationsNet	1083685000	USD
CY2021Q3	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	54366000	USD
CY2020Q3	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	18149000	USD
CY2021Q3	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	1015415000	USD
CY2020Q3	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	1065536000	USD
CY2021Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	38327000	USD
CY2021Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	345070000	USD
CY2021Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	17211000	USD
CY2021Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	15062000	USD
CY2021Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	1789000	USD
CY2021Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	608319000	USD
CY2021Q3	us-gaap	Long Term Debt LongTermDebt	1025778000	USD
CY2021Q3	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	8141000	USD
CY2021Q3	cmc	Long Term Debt Net Of Finance Leases LongTermDebtNetOfFinanceLeases	1017637000	USD
CY2021	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	2800000	USD
CY2020	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	2500000	USD
CY2019	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	300000	USD
	cmc	Number Of New Markets Tax Credit Transactions NumberOfNewMarketsTaxCreditTransactions	3	numberOfTaxCreditTransactions
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	413616000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	334170000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	194986000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	120402000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	36608000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	73474000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	534018000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	370778000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	268460000	USD
CY2021	cmc	Current Federal Tax Expense Benefit From Continuing And Discontinued Operations CurrentFederalTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	113696000	USD
CY2020	cmc	Current Federal Tax Expense Benefit From Continuing And Discontinued Operations CurrentFederalTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	26901000	USD
CY2019	cmc	Current Federal Tax Expense Benefit From Continuing And Discontinued Operations CurrentFederalTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	621000	USD
CY2021	cmc	Current Foreign Tax Expense Benefit From Continuing And Discontinued Operations CurrentForeignTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	25642000	USD
CY2020	cmc	Current Foreign Tax Expense Benefit From Continuing And Discontinued Operations CurrentForeignTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	7588000	USD
CY2019	cmc	Current Foreign Tax Expense Benefit From Continuing And Discontinued Operations CurrentForeignTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	14006000	USD
CY2021	cmc	Current State And Local Tax Expense Benefit From Continuing And Discontinued Operations CurrentStateAndLocalTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	19458000	USD
CY2020	cmc	Current State And Local Tax Expense Benefit From Continuing And Discontinued Operations CurrentStateAndLocalTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	7133000	USD
CY2019	cmc	Current State And Local Tax Expense Benefit From Continuing And Discontinued Operations CurrentStateAndLocalTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	2892000	USD
CY2021	cmc	Current Income Tax Expense Benefit From Continuing And Discontinued Operations CurrentIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	158796000	USD
CY2020	cmc	Current Income Tax Expense Benefit From Continuing And Discontinued Operations CurrentIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	41622000	USD
CY2019	cmc	Current Income Tax Expense Benefit From Continuing And Discontinued Operations CurrentIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	17519000	USD
CY2021	cmc	Deferred Federal Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredFederalIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	-10563000	USD
CY2020	cmc	Deferred Federal Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredFederalIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	45771000	USD
CY2019	cmc	Deferred Federal Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredFederalIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	46922000	USD
CY2021	cmc	Deferred Foreign Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredForeignIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	-2512000	USD
CY2020	cmc	Deferred Foreign Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredForeignIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	-43000	USD
CY2019	cmc	Deferred Foreign Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredForeignIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	490000	USD
CY2021	cmc	Deferred State And Local Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredStateAndLocalIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	-24568000	USD
CY2020	cmc	Deferred State And Local Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredStateAndLocalIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	5832000	USD
CY2019	cmc	Deferred State And Local Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredStateAndLocalIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	4908000	USD
CY2021	cmc	Deferred Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	-37643000	USD
CY2020	cmc	Deferred Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	51560000	USD
CY2019	cmc	Deferred Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	52320000	USD
CY2021	cmc	Income Tax Expense Benefit From Continuing And Discontinued Operations IncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	121153000	USD
CY2020	cmc	Income Tax Expense Benefit From Continuing And Discontinued Operations IncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	93182000	USD
CY2019	cmc	Income Tax Expense Benefit From Continuing And Discontinued Operations IncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	69839000	USD
CY2021	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	0	USD
CY2020	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	706000	USD
CY2019	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	158000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	121153000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	92476000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	69681000	USD
CY2021	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	112144000	USD
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	77863000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	56377000	USD
CY2021	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	37092000	USD
CY2020	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	968000	USD
CY2019	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	36167000	USD
CY2021	cmc	Effective Income Tax Rate Reconciliation Impairmenton Valuationof Subsidiaries EffectiveIncomeTaxRateReconciliationImpairmentonValuationofSubsidiaries	29866000	USD
CY2020	cmc	Effective Income Tax Rate Reconciliation Impairmenton Valuationof Subsidiaries EffectiveIncomeTaxRateReconciliationImpairmentonValuationofSubsidiaries	-5084000	USD
CY2019	cmc	Effective Income Tax Rate Reconciliation Impairmenton Valuationof Subsidiaries EffectiveIncomeTaxRateReconciliationImpairmentonValuationofSubsidiaries	29697000	USD
CY2021	cmc	Effective Income Tax Rate Reconciliation Global Intangible Low Taxed Income Amount EffectiveIncomeTaxRateReconciliationGlobalIntangibleLowTaxedIncomeAmount	17263000	USD
CY2020	cmc	Effective Income Tax Rate Reconciliation Global Intangible Low Taxed Income Amount EffectiveIncomeTaxRateReconciliationGlobalIntangibleLowTaxedIncomeAmount	1252000	USD
CY2019	cmc	Effective Income Tax Rate Reconciliation Global Intangible Low Taxed Income Amount EffectiveIncomeTaxRateReconciliationGlobalIntangibleLowTaxedIncomeAmount	1541000	USD
CY2021	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	14617000	USD
CY2020	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	-8000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	9799000	USD
CY2021	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-3838000	USD
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	9895000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	6085000	USD
CY2021	cmc	Effective Income Tax Rate Reconciliation Toll Chargeand Related Foreign Tax Credits EffectiveIncomeTaxRateReconciliationTollChargeandRelatedForeignTaxCredits	0	USD
CY2020	cmc	Effective Income Tax Rate Reconciliation Toll Chargeand Related Foreign Tax Credits EffectiveIncomeTaxRateReconciliationTollChargeandRelatedForeignTaxCredits	0	USD
CY2019	cmc	Effective Income Tax Rate Reconciliation Toll Chargeand Related Foreign Tax Credits EffectiveIncomeTaxRateReconciliationTollChargeandRelatedForeignTaxCredits	7410000	USD
CY2021	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	2975000	USD
CY2020	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-2594000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	1597000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	121153000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	92476000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	69681000	USD
CY2021	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.227
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.249
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.260
CY2021Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	291145000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	283416000	USD
CY2021Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	64693000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	32293000	USD
CY2021Q3	cmc	Deferred Tax Assets Right Of Use Operating Lease Liabilities DeferredTaxAssetsRightOfUseOperatingLeaseLiabilities	28915000	USD
CY2020Q3	cmc	Deferred Tax Assets Right Of Use Operating Lease Liabilities DeferredTaxAssetsRightOfUseOperatingLeaseLiabilities	29619000	USD
CY2021Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Other DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther	13846000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Other DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther	30371000	USD
CY2021Q3	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	3817000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	3315000	USD
CY2021Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	402416000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	379014000	USD
CY2021Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	278099000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	281849000	USD
CY2021Q3	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	124317000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	97165000	USD
CY2021Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	180925000	USD
CY2020Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	185595000	USD
CY2021Q3	cmc	Deferred Tax Liabilities Right Of Use Operating Lease Assets DeferredTaxLiabilitiesRightOfUseOperatingLeaseAssets	26950000	USD
CY2020Q3	cmc	Deferred Tax Liabilities Right Of Use Operating Lease Assets DeferredTaxLiabilitiesRightOfUseOperatingLeaseAssets	28201000	USD
CY2021Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	8940000	USD
CY2020Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	2420000	USD
CY2021Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	216815000	USD
CY2020Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	216216000	USD
CY2021Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	92498000	USD
CY2020Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	119051000	USD
CY2021	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	-3800000	USD
CY2020Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	8652000	USD
CY2019Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	8652000	USD
CY2018Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	3121000	USD
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	5531000	USD
CY2021	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	3121000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2021Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	5531000	USD
CY2020Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	8652000	USD
CY2019Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	8652000	USD
CY2021	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	43700000	USD
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	31900000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	25100000	USD
CY2021Q3	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	13700000	USD
CY2021	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P3Y
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	5264516	shares
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	25600000	USD
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	26700000	USD
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	19900000	USD
CY2021	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-1557000	USD
CY2020	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Curtailments DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments	3200000	USD
CY2021	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Curtailments DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments	0	USD
CY2020Q3	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	36130000	USD
CY2019Q3	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	31661000	USD
CY2021	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	0	USD
CY2020	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	335000	USD
CY2021	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	724000	USD
CY2020	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	892000	USD
CY2021	us-gaap	Defined Benefit Plan Curtailments DefinedBenefitPlanCurtailments	0	USD
CY2020	us-gaap	Defined Benefit Plan Curtailments DefinedBenefitPlanCurtailments	1314000	USD
CY2021	us-gaap	Defined Benefit Plan Special Termination Benefits DefinedBenefitPlanSpecialTerminationBenefits	0	USD
CY2020	us-gaap	Defined Benefit Plan Special Termination Benefits DefinedBenefitPlanSpecialTerminationBenefits	1918000	USD
CY2020	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	1280000	USD
CY2021	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	1610000	USD
CY2020	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	1270000	USD
CY2021Q3	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	33687000	USD
CY2020Q3	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	36130000	USD
CY2020Q3	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	29201000	USD
CY2019Q3	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	23435000	USD
CY2021	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	4042000	USD
CY2020	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	2248000	USD
CY2021	us-gaap	Defined Benefit Plan Administration Expenses DefinedBenefitPlanAdministrationExpenses	52000	USD
CY2020	us-gaap	Defined Benefit Plan Administration Expenses DefinedBenefitPlanAdministrationExpenses	496000	USD
CY2021	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	2545000	USD
CY2020	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	5284000	USD
CY2021	us-gaap	Defined Benefit Plan Plan Assets Benefits Paid DefinedBenefitPlanPlanAssetsBenefitsPaid	1610000	USD
CY2020	us-gaap	Defined Benefit Plan Plan Assets Benefits Paid DefinedBenefitPlanPlanAssetsBenefitsPaid	1270000	USD
CY2021Q3	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	34126000	USD
CY2020Q3	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	29201000	USD
CY2021Q3	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	439000	USD
CY2020Q3	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	-6929000	USD
CY2021Q3	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	-1110000	USD
CY2020Q3	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	3234000	USD
CY2021Q3	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.029
CY2020Q3	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.028
CY2021	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.048
CY2020	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.050
CY2021	us-gaap	Defined Benefit Plan Cost Of Providing Special Or Contractual Termination Benefit Recognized During Period DefinedBenefitPlanCostOfProvidingSpecialOrContractualTerminationBenefitRecognizedDuringPeriod	0	USD
CY2020	us-gaap	Defined Benefit Plan Cost Of Providing Special Or Contractual Termination Benefit Recognized During Period DefinedBenefitPlanCostOfProvidingSpecialOrContractualTerminationBenefitRecognizedDuringPeriod	1918000	USD
CY2019	us-gaap	Defined Benefit Plan Cost Of Providing Special Or Contractual Termination Benefit Recognized During Period DefinedBenefitPlanCostOfProvidingSpecialOrContractualTerminationBenefitRecognizedDuringPeriod	0	USD
CY2021	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements And Curtailments1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1	0	USD
CY2020	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements And Curtailments1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1	-1314000	USD
CY2019	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements And Curtailments1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1	0	USD
CY2021	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	-479000	USD
CY2020	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	3575000	USD
CY2019	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	522000	USD
CY2021	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	4344000	USD
CY2020	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-3642000	USD
CY2019	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-2823000	USD
CY2021	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	0	USD
CY2020	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	3232000	USD
CY2019	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	0	USD
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-4344000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	410000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	2823000	USD
CY2021	cmc	Defined Benefit Plan Effective Interest Rateon Benefit Obligations DefinedBenefitPlanEffectiveInterestRateonBenefitObligations	0.021
CY2020	cmc	Defined Benefit Plan Effective Interest Rateon Benefit Obligations DefinedBenefitPlanEffectiveInterestRateonBenefitObligations	0.028
CY2019	cmc	Defined Benefit Plan Effective Interest Rateon Benefit Obligations DefinedBenefitPlanEffectiveInterestRateonBenefitObligations	0.043
CY2020	cmc	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Effective Ratefor Service Cost DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostEffectiveRateforServiceCost	0.033
CY2019	cmc	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Effective Ratefor Service Cost DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostEffectiveRateforServiceCost	0.047
CY2021	cmc	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Rate Of Return DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermRateOfReturn	0.050
CY2020	cmc	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Rate Of Return DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermRateOfReturn	0.060
CY2019	cmc	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Rate Of Return DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermRateOfReturn	0.060
CY2021	cmc	Defined Benefit Plan Effective Interest Rate On Benefit Obligations Remeasured DefinedBenefitPlanEffectiveInterestRateOnBenefitObligationsRemeasured	0.029
CY2021	cmc	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Effective Rate For Service Cost Remeasured DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostEffectiveRateForServiceCostRemeasured	0.035
CY2021Q3	us-gaap	Defined Benefit Plan Expected Future Employer Contributions Next Fiscal Year DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear	0	USD
CY2021Q3	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1.000
CY2020Q3	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1.000
CY2021Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	1723000	USD
CY2021Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Two DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	1736000	USD
CY2021Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Three DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	1746000	USD
CY2021Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Four DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	1733000	USD
CY2021Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	1717000	USD
CY2021Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	8581000	USD
CY2014Q4	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	100000000	USD
CY2020	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	0	shares
CY2019	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	0	shares
CY2021	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	0	shares
CY2021Q3	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	27600000	USD
CY2021Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000000000	shares
CY2020Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000000000	shares
CY2020Q3	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1.00
CY2021Q3	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1.00
CY2021Q3	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2020Q3	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2021	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	412865000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	278302000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	198779000	USD
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	120338357	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	118921854	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	117834558	shares
CY2021	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	3.43
CY2020	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.34
CY2019	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.69
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	120338357	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	118921854	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	117834558	shares
CY2021	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1645140	shares
CY2020	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1387767	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1290070	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	121983497	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	120309621	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	119124628	shares
CY2021	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	3.38
CY2020	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.31
CY2019	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.67
CY2021Q3	cmc	Site Contingency Accrual For Environmental Loss Contingencies SiteContingencyAccrualForEnvironmentalLossContingencies	500000	USD
CY2020Q3	cmc	Site Contingency Accrual For Environmental Loss Contingencies SiteContingencyAccrualForEnvironmentalLossContingencies	700000	USD
CY2020Q3	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	43362000	USD
CY2021Q3	us-gaap	Accrued Salaries Current AccruedSalariesCurrent	166332000	USD
CY2020Q3	us-gaap	Accrued Salaries Current AccruedSalariesCurrent	164442000	USD
CY2021Q3	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	57548000	USD
CY2021Q3	us-gaap	Accrued Insurance Current AccruedInsuranceCurrent	38618000	USD
CY2020Q3	us-gaap	Accrued Insurance Current AccruedInsuranceCurrent	39375000	USD
CY2021	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	2	segments
CY2021	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	412865000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	278302000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	198779000	USD
CY2021	us-gaap	Interest Expense InterestExpense	51904000	USD
CY2020	us-gaap	Interest Expense InterestExpense	61837000	USD
CY2019	us-gaap	Interest Expense InterestExpense	71373000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	121153000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	92476000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	69681000	USD
CY2021	cmc	Amortization Acquired Unfavorable Contract Backlog AmortizationAcquiredUnfavorableContractBacklog	6035000	USD
CY2020	cmc	Amortization Acquired Unfavorable Contract Backlog AmortizationAcquiredUnfavorableContractBacklog	29367000	USD
CY2019	cmc	Amortization Acquired Unfavorable Contract Backlog AmortizationAcquiredUnfavorableContractBacklog	74784000	USD
CY2021	cmc	Asset Impairment Charges From Continuing Operations AssetImpairmentChargesFromContinuingOperations	6784000	USD
CY2020	cmc	Asset Impairment Charges From Continuing Operations AssetImpairmentChargesFromContinuingOperations	7611000	USD
CY2019	cmc	Asset Impairment Charges From Continuing Operations AssetImpairmentChargesFromContinuingOperations	384000	USD
CY2021	cmc	Adjusted Operating Profit Loss From Continuing Operation AdjustedOperatingProfitLossFromContinuingOperation	754284000	USD
CY2020	cmc	Adjusted Operating Profit Loss From Continuing Operation AdjustedOperatingProfitLossFromContinuingOperation	576608000	USD
CY2019	cmc	Adjusted Operating Profit Loss From Continuing Operation AdjustedOperatingProfitLossFromContinuingOperation	424085000	USD
CY2021	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	6729760000	USD
CY2020	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	5476486000	USD
CY2019	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	5829002000	USD
CY2021Q3	us-gaap	Noncurrent Assets NoncurrentAssets	1699350000	USD
CY2020Q3	us-gaap	Noncurrent Assets NoncurrentAssets	1708344000	USD
CY2019Q3	us-gaap	Noncurrent Assets NoncurrentAssets	1599218000	USD
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	5264516	shares

Files In Submission

Name	View Source	Status
0000022444-21-000126-index-headers.html	Edgar Link	pending
0000022444-21-000126-index.html	Edgar Link	pending
0000022444-21-000126.txt	Edgar Link	pending
0000022444-21-000126-xbrl.zip	Edgar Link	pending
cmc-08312021xform10xkxex101.htm	Edgar Link	pending
cmc-08312021xform10xkxex21.htm	Edgar Link	pending
cmc-08312021xform10xkxex23.htm	Edgar Link	pending
cmc-08312021xform10xkxex31a.htm	Edgar Link	pending
cmc-08312021xform10xkxex31b.htm	Edgar Link	pending
cmc-08312021xform10xkxex32a.htm	Edgar Link	pending
cmc-08312021xform10xkxex32b.htm	Edgar Link	pending
cmc-08312021xform10xkxex41.htm	Edgar Link	pending
cmc-20210831.htm	Edgar Link	pending
cmc-20210831.xsd	Edgar Link	pending
cmc-20210831_cal.xml	Edgar Link	unprocessable
cmc-20210831_def.xml	Edgar Link	unprocessable
cmc-20210831_g1.jpg	Edgar Link	pending
cmc-20210831_g2.gif	Edgar Link	pending
cmc-20210831_g3.jpg	Edgar Link	pending
cmc-20210831_htm.xml	Edgar Link	completed
cmc-20210831_lab.xml	Edgar Link	unprocessable
cmc-20210831_pre.xml	Edgar Link	unprocessable
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R100.htm	Edgar Link	pending
R101.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
R13.htm	Edgar Link	pending
R14.htm	Edgar Link	pending
R15.htm	Edgar Link	pending
R16.htm	Edgar Link	pending
R17.htm	Edgar Link	pending
R18.htm	Edgar Link	pending
R19.htm	Edgar Link	pending
R2.htm	Edgar Link	pending
R20.htm	Edgar Link	pending
R21.htm	Edgar Link	pending
R22.htm	Edgar Link	pending
R23.htm	Edgar Link	pending
R24.htm	Edgar Link	pending
R25.htm	Edgar Link	pending
R26.htm	Edgar Link	pending
R27.htm	Edgar Link	pending
R28.htm	Edgar Link	pending
R29.htm	Edgar Link	pending
R3.htm	Edgar Link	pending
R30.htm	Edgar Link	pending
R31.htm	Edgar Link	pending
R32.htm	Edgar Link	pending
R33.htm	Edgar Link	pending
R34.htm	Edgar Link	pending
R35.htm	Edgar Link	pending
R36.htm	Edgar Link	pending
R37.htm	Edgar Link	pending
R38.htm	Edgar Link	pending
R39.htm	Edgar Link	pending
R4.htm	Edgar Link	pending
R40.htm	Edgar Link	pending
R41.htm	Edgar Link	pending
R42.htm	Edgar Link	pending
R43.htm	Edgar Link	pending
R44.htm	Edgar Link	pending
R45.htm	Edgar Link	pending
R46.htm	Edgar Link	pending
R47.htm	Edgar Link	pending
R48.htm	Edgar Link	pending
R49.htm	Edgar Link	pending
R5.htm	Edgar Link	pending
R50.htm	Edgar Link	pending
R51.htm	Edgar Link	pending
R52.htm	Edgar Link	pending
R53.htm	Edgar Link	pending
R54.htm	Edgar Link	pending
R55.htm	Edgar Link	pending
R56.htm	Edgar Link	pending
R57.htm	Edgar Link	pending
R58.htm	Edgar Link	pending
R59.htm	Edgar Link	pending
R6.htm	Edgar Link	pending
R60.htm	Edgar Link	pending
R61.htm	Edgar Link	pending
R62.htm	Edgar Link	pending
R63.htm	Edgar Link	pending
R64.htm	Edgar Link	pending
R65.htm	Edgar Link	pending
R66.htm	Edgar Link	pending
R67.htm	Edgar Link	pending
R68.htm	Edgar Link	pending
R69.htm	Edgar Link	pending
R7.htm	Edgar Link	pending
R70.htm	Edgar Link	pending
R71.htm	Edgar Link	pending
R72.htm	Edgar Link	pending
R73.htm	Edgar Link	pending
R74.htm	Edgar Link	pending
R75.htm	Edgar Link	pending
R76.htm	Edgar Link	pending
R77.htm	Edgar Link	pending
R78.htm	Edgar Link	pending
R79.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R80.htm	Edgar Link	pending
R81.htm	Edgar Link	pending
R82.htm	Edgar Link	pending
R83.htm	Edgar Link	pending
R84.htm	Edgar Link	pending
R85.htm	Edgar Link	pending
R86.htm	Edgar Link	pending
R87.htm	Edgar Link	pending
R88.htm	Edgar Link	pending
R89.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
R90.htm	Edgar Link	pending
R91.htm	Edgar Link	pending
R92.htm	Edgar Link	pending
R93.htm	Edgar Link	pending
R94.htm	Edgar Link	pending
R95.htm	Edgar Link	pending
R96.htm	Edgar Link	pending
R97.htm	Edgar Link	pending
R98.htm	Edgar Link	pending
R99.htm	Edgar Link	pending
R9999.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending

Create your account

Find Stocks Worth Researching

Deeply Understand Businesses

Value Businesses Intelligently

$CMC
COMMERCIAL METALS Co Stock $cmc

2021 Q3 Form 10-K Financial Statement

#000002244421000126 Filed on October 14, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CMC COMMERCIAL METALS Co Stock $cmc

2021 Q3 Form 10-K Financial Statement

#000002244421000126 Filed on October 14, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CMC
COMMERCIAL METALS Co Stock $cmc