$CMC
COMMERCIAL METALS Co Stock $cmc

$cmc Overview Financials Valuation SEC Filings Company Website

2018 Q3 Form 10-K Financial Statement

#000002244419000042 Filed on October 23, 2019

Income Statement

Concept	2018 Q3	2018 Q2	2018 Q1
Revenue	$1.308B	$1.204B	$1.054B
YoY Change	3.76%	-4.46%	22.26%
Cost Of Revenue	$1.116B	$1.036B	$927.1M
YoY Change	14.22%	15.58%	27.87%
Gross Profit	$183.4M	$168.6M	$127.2M
YoY Change	53.76%	13.56%	-7.34%
Gross Profit Margin	14.02%	14.0%	12.06%
Selling, General & Admin	$108.4M	$101.4M	$108.5M
YoY Change	3.24%	8.57%	15.35%
% of Gross Profit	59.1%	60.17%	85.3%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$32.30M	$33.10M	$34.10M
YoY Change	0.62%	2.8%	11.8%
% of Gross Profit	17.61%	19.64%	26.82%
Operating Expenses	$108.4M	$101.4M	$108.5M
YoY Change	3.24%	8.57%	15.35%
Operating Profit	$75.01M	$67.15M	$18.69M
YoY Change	425.07%	22.04%	-56.74%
Interest Expense	-$24.70M	$11.51M	$7.181M
YoY Change	-485.94%	-7.53%	-42.27%
% of Operating Profit	-32.93%	17.14%	38.42%
Other Income/Expense, Net
YoY Change
Pretax Income	$57.90M	$55.64M	$11.51M
YoY Change	-461.88%	30.69%	-62.59%
Income Tax	$5.600M	$13.31M	$1.728M
% Of Pretax Income	9.67%	23.93%	15.01%
Net Earnings	$51.56M	$39.97M	$10.17M
YoY Change	-274.54%	1.78%	-66.47%
Net Earnings / Revenue	3.94%	3.32%	0.96%
Basic Earnings Per Share	$0.44	$0.34	$0.09
Diluted Earnings Per Share	$0.44	$0.34	$0.09
COMMON SHARES
Basic Shares Outstanding		117.1M shares	116.8M shares
Diluted Shares Outstanding		118.3M shares	118.3M shares

Balance Sheet

Concept	2018 Q3	2018 Q2	2018 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments	$622.5M	$600.4M	$195.2M
YoY Change	146.44%	117.69%	-50.64%
Cash & Equivalents	$632.6M	$610.1M	$214.5M
Short-Term Investments
Other Short-Term Assets	$116.2M	$109.7M	$118.4M
YoY Change	-17.05%	1.3%	22.83%
Inventory	$589.0M	$595.2M	$523.4M
Prepaid Expenses
Receivables	$749.5M	$678.3M	$634.7M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$2.077B	$1.995B	$1.648B
YoY Change	21.2%	-2.78%	-17.06%
LONG-TERM ASSETS
Property, Plant & Equipment	$1.075B	$1.074B	$1.083B
YoY Change	2.22%	5.65%	15.19%
Goodwill	$64.31M	$64.32M	$64.50M
YoY Change	-0.93%	-3.67%	-3.05%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$111.8M	$111.9M	$114.7M
YoY Change	-22.74%	-19.49%	-16.81%
Total Long-Term Assets	$1.251B	$1.251B	$1.262B
YoY Change	-0.8%	2.29%	10.28%
TOTAL ASSETS
Total Short-Term Assets	$2.077B	$1.995B	$1.648B
Total Long-Term Assets	$1.251B	$1.251B	$1.262B
Total Assets	$3.328B	$3.245B	$2.910B
YoY Change	11.87%	-0.89%	-7.07%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$261.3M	$241.6M	$247.6M
YoY Change	15.36%	-30.27%	-19.48%
Accrued Expenses	$260.9M	$247.6M	$213.2M
YoY Change	-5.1%	-4.12%	-3.27%
Deferred Revenue	$6.679M
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$19.70M	$19.90M	$19.00M
YoY Change	2.6%	-93.62%	-93.91%
Total Short-Term Liabilities	$541.9M	$511.9M	$530.3M
YoY Change	-10.93%	-44.14%	-36.88%
LONG-TERM LIABILITIES
Long-Term Debt	$1.139B	$1.139B	$799.8M
YoY Change	41.34%	51.54%	6.34%
Other Long-Term Liabilities	$116.3M	$110.8M	$109.9M
YoY Change	4.78%	-12.67%	-9.85%
Total Long-Term Liabilities	$116.3M	$110.8M	$109.9M
YoY Change	4.78%	-12.67%	-9.85%
TOTAL LIABILITIES
Total Short-Term Liabilities	$541.9M	$511.9M	$530.3M
Total Long-Term Liabilities	$116.3M	$110.8M	$109.9M
Total Liabilities	$1.835B	$1.793B	$1.459B
YoY Change	16.55%	-3.44%	-17.56%
SHAREHOLDERS EQUITY
Retained Earnings	$1.446B	$1.409B	$1.383B
YoY Change	6.06%	0.1%	0.07%
Common Stock	$354.0M	$349.0M	$350.7M
YoY Change	0.97%	2.71%	3.98%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$213.4M	$213.4M	$215.8M
YoY Change	-8.06%	-8.08%	-7.13%
Treasury Stock Shares	12.05M shares	12.05M shares	12.23M shares
Shareholders Equity	$1.493B	$1.453B	$1.451B
YoY Change
Total Liabilities & Shareholders Equity	$3.328B	$3.245B	$2.910B
YoY Change	11.87%	-0.89%	-7.07%

Cashflow Statement

Concept	2018 Q3	2018 Q2	2018 Q1
OPERATING ACTIVITIES
Net Income	$51.56M	$39.97M	$10.17M
YoY Change	-274.54%	1.78%	-66.47%
Depreciation, Depletion And Amortization	$32.30M	$33.10M	$34.10M
YoY Change	0.62%	2.8%	11.8%
Cash From Operating Activities	-$103.4M	-$146.9M	-$63.40M
YoY Change	-80.93%	-2228.99%	-587.69%
INVESTING ACTIVITIES
Capital Expenditures	-$30.40M	-$43.30M	-$41.30M
YoY Change	-40.39%	-39.27%	-13.6%
Acquisitions
YoY Change
Other Investing Activities	$174.6M	$263.5M	$176.7M
YoY Change	-79.54%	-728.88%	-966.18%
Cash From Investing Activities	$144.2M	$220.3M	$135.3M
YoY Change	-82.03%	-294.61%	-298.39%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-18.10M	323.0M	-21.10M
YoY Change	-93.33%	-2423.74%	37.91%
NET CHANGE
Cash From Operating Activities	-103.4M	-146.9M	-63.40M
Cash From Investing Activities	144.2M	220.3M	135.3M
Cash From Financing Activities	-18.10M	323.0M	-21.10M
Net Change In Cash	22.70M	396.4M	50.80M
YoY Change	-302.68%	-429.78%	-172.06%
FREE CASH FLOW
Cash From Operating Activities	-$103.4M	-$146.9M	-$63.40M
Capital Expenditures	-$30.40M	-$43.30M	-$41.30M
Free Cash Flow	-$73.00M	-$103.6M	-$22.10M
YoY Change	-85.14%	-232.48%	-136.35%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2019	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2019	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
CY2019	dei	Entity Central Index Key EntityCentralIndexKey	0000022444
CY2018Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	4489000	USD
CY2019Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	8403000	USD
CY2019Q1	cmc	Minimum Percentage Of Share Ownership Deemed Affiliates MinimumPercentageOfShareOwnershipDeemedAffiliates	0.10	pure
CY2019	dei	Amendment Flag AmendmentFlag	false
CY2019	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--08-31
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2200000	USD
CY2017Q3	us-gaap	Cash Cash Equivalents And Short Term Investments CashCashEquivalentsAndShortTermInvestments	252595000	USD
CY2017	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.48
CY2018	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.48
CY2019	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.48
CY2018Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2019Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2018Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	200000000	shares
CY2019Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	200000000	shares
CY2018Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	129060664	shares
CY2019Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	129060664	shares
CY2018Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	117015558	shares
CY2019Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	117924938	shares
CY2017Q3	us-gaap	Restricted Cash RestrictedCash	33286000	USD
CY2018Q3	us-gaap	Restricted Cash RestrictedCash	10142000	USD
CY2019Q3	us-gaap	Restricted Cash RestrictedCash	1268000	USD
CY2018Q3	us-gaap	Treasury Stock Shares TreasuryStockShares	12045106	shares
CY2019Q3	us-gaap	Treasury Stock Shares TreasuryStockShares	11135726	shares
CY2019	dei	Document Type DocumentType	10-K
CY2019	dei	Document Annual Report DocumentAnnualReport	true
CY2019	dei	Document Period End Date DocumentPeriodEndDate	2019-08-31
CY2019	dei	Document Transition Report DocumentTransitionReport	false
CY2019	dei	Entity File Number EntityFileNumber	1-4304
CY2019	dei	Entity Registrant Name EntityRegistrantName	Commercial Metals Company
CY2019	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2019	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	75-0725338
CY2019	dei	Entity Address Address Line1 EntityAddressAddressLine1	6565 N. MacArthur Blvd.
CY2019	dei	Entity Address City Or Town EntityAddressCityOrTown	Irving
CY2019	dei	Entity Address State Or Province EntityAddressStateOrProvince	TX
CY2019	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	75039
CY2019	dei	City Area Code CityAreaCode	214
CY2019	dei	Local Phone Number LocalPhoneNumber	689-4300
CY2019	dei	Security12b Title Security12bTitle	Common Stock, $0.01 par value
CY2019	dei	Trading Symbol TradingSymbol	CMC
CY2019	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2019	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2019	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2019	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2019	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2019	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2019	dei	Entity Small Business EntitySmallBusiness	false
CY2019	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2019	dei	Entity Shell Company EntityShellCompany	false
CY2019Q1	dei	Entity Public Float EntityPublicFloat	1900000000	USD
CY2019Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	117934611	shares
CY2019	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	5829002000	USD
CY2018	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	4643723000	USD
CY2017	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	3844069000	USD
CY2019	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	5025514000	USD
CY2018	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	4021558000	USD
CY2017	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	3322711000	USD
CY2019	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	463271000	USD
CY2018	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	401452000	USD
CY2017	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	387354000	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2017	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-22672000	USD
CY2019	cmc	Asset Impairment Charges From Continuing Operations AssetImpairmentChargesFromContinuingOperations	384000	USD
CY2018	cmc	Asset Impairment Charges From Continuing Operations AssetImpairmentChargesFromContinuingOperations	14372000	USD
CY2017	cmc	Asset Impairment Charges From Continuing Operations AssetImpairmentChargesFromContinuingOperations	1730000	USD
CY2019	us-gaap	Interest Expense InterestExpense	71373000	USD
CY2018	us-gaap	Interest Expense InterestExpense	40957000	USD
CY2017	us-gaap	Interest Expense InterestExpense	44151000	USD
CY2019	us-gaap	Costs And Expenses CostsAndExpenses	5560542000	USD
CY2018	us-gaap	Costs And Expenses CostsAndExpenses	4478339000	USD
CY2017	us-gaap	Costs And Expenses CostsAndExpenses	3778618000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	268460000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	165384000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	65451000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	69681000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	30147000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	15276000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	198779000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	135237000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	50175000	USD
CY2019	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	-528000	USD
CY2018	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	3235000	USD
CY2017	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	-9840000	USD
CY2019	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	158000	USD
CY2018	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	-34000	USD
CY2017	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	-5997000	USD
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-686000	USD
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	3269000	USD
CY2017	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-3843000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	198093000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	138506000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	46332000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.69
CY2018	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.16
CY2017	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.43
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-0.01
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.03
CY2017	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-0.03
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.68
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.19
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.40
CY2019	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.67
CY2018	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.14
CY2017	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.43
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.01
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.03
CY2017	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.03
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.66
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	244000	USD
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.17
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.39
CY2019	us-gaap	Net Income Loss NetIncomeLoss	198093000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	138506000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	46332000	USD
CY2019	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	-29718000	USD
CY2018	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	-13938000	USD
CY2017	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	30509000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax	-857000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax	-2079000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax	-968000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-28861000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-11859000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	31477000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-6000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	48000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	756000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	279000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	1355000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-250000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-231000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-599000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax	2629000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax	138000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax	-439000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	0	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-126000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-154000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	-25000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	-62000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	-70000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Finalization Of Pension And Non Pension Postretirement Plan Valuation Net Of Tax OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax	1316000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Finalization Of Pension And Non Pension Postretirement Plan Valuation Net Of Tax OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax	0	USD
CY2017	us-gaap	Other Comprehensive Income Loss Finalization Of Pension And Non Pension Postretirement Plan Valuation Net Of Tax OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax	0	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	1338000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	74000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-523000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-30449000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-12164000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	31401000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	167644000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	126342000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	77733000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents And Short Term Investments CashCashEquivalentsAndShortTermInvestments	192461000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents And Short Term Investments CashCashEquivalentsAndShortTermInvestments	622473000	USD
CY2019Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	1016088000	USD
CY2018Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	749484000	USD
CY2019Q3	us-gaap	Inventory Net InventoryNet	692368000	USD
CY2018Q3	us-gaap	Inventory Net InventoryNet	589005000	USD
CY2019Q3	us-gaap	Other Assets Current OtherAssetsCurrent	179088000	USD
CY2018Q3	us-gaap	Other Assets Current OtherAssetsCurrent	116243000	USD
CY2019Q3	us-gaap	Assets Current AssetsCurrent	2080005000	USD
CY2018Q3	us-gaap	Assets Current AssetsCurrent	2077205000	USD
CY2019Q3	us-gaap	Land Land	142825000	USD
CY2018Q3	us-gaap	Land Land	85288000	USD
CY2019Q3	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	750381000	USD
CY2018Q3	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	631501000	USD
CY2019Q3	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	2234800000	USD
CY2018Q3	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	1918342000	USD
CY2019Q3	us-gaap	Construction In Progress Gross ConstructionInProgressGross	68579000	USD
CY2018Q3	us-gaap	Construction In Progress Gross ConstructionInProgressGross	35741000	USD
CY2019Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	3196585000	USD
CY2018Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	2670872000	USD
CY2019Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1695614000	USD
CY2018Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1595834000	USD
CY2019Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1500971000	USD
CY2018Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1075038000	USD
CY2019Q3	us-gaap	Goodwill Goodwill	64138000	USD
CY2018Q3	us-gaap	Goodwill Goodwill	64310000	USD
CY2019Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	113657000	USD
CY2018Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	111751000	USD
CY2019Q3	us-gaap	Assets Assets	3758771000	USD
CY2018Q3	us-gaap	Assets Assets	3328304000	USD
CY2019Q3	us-gaap	Accounts Payable Trade Current AccountsPayableTradeCurrent	288005000	USD
CY2018Q3	us-gaap	Accounts Payable Trade Current AccountsPayableTradeCurrent	261258000	USD
CY2019Q3	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	353786000	USD
CY2018Q3	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	260939000	USD
CY2019Q3	cmc	Business Combination Acquired Unfavorable Contract Backlog BusinessCombinationAcquiredUnfavorableContractBacklog	35360000	USD
CY2018Q3	cmc	Business Combination Acquired Unfavorable Contract Backlog BusinessCombinationAcquiredUnfavorableContractBacklog	0	USD
CY2019Q3	cmc	Borrowingsunder Accounts Receivable Programs Current BorrowingsunderAccountsReceivableProgramsCurrent	3929000	USD
CY2019Q3	us-gaap	Liabilities Current LiabilitiesCurrent	694590000	USD
CY2018Q3	cmc	Borrowingsunder Accounts Receivable Programs Current BorrowingsunderAccountsReceivableProgramsCurrent	0	USD
CY2019Q3	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	13510000	USD
CY2018Q3	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	19746000	USD
CY2018Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	352674000	USD
CY2019Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-124126000	USD
CY2018Q3	us-gaap	Liabilities Current LiabilitiesCurrent	541943000	USD
CY2019Q3	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	79290000	USD
CY2018Q3	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	37834000	USD
CY2019Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	133620000	USD
CY2018Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	116325000	USD
CY2019Q3	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	1227214000	USD
CY2018Q3	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	1138619000	USD
CY2019Q3	us-gaap	Liabilities Liabilities	2134714000	USD
CY2018Q3	us-gaap	Liabilities Liabilities	1834721000	USD
CY2019Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2018Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q3	us-gaap	Common Stock Value CommonStockValue	1290000	USD
CY2018Q3	us-gaap	Common Stock Value CommonStockValue	1290000	USD
CY2019Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	358668000	USD
CY2018Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-93677000	USD
CY2019Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1585379000	USD
CY2018Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1446495000	USD
CY2019Q3	us-gaap	Treasury Stock Value TreasuryStockValue	197350000	USD
CY2018Q3	us-gaap	Treasury Stock Value TreasuryStockValue	213385000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	1623861000	USD
CY2018Q3	us-gaap	Stockholders Equity StockholdersEquity	1493397000	USD
CY2019Q3	us-gaap	Minority Interest MinorityInterest	196000	USD
CY2018Q3	us-gaap	Minority Interest MinorityInterest	186000	USD
CY2019Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1624057000	USD
CY2018Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1493583000	USD
CY2019Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	3758771000	USD
CY2018Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	3328304000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	198093000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	138506000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	46332000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	158671000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	131659000	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	125071000	USD
CY2019	cmc	Amortization Acquired Unfavorable Contract Backlog AmortizationAcquiredUnfavorableContractBacklog	74784000	USD
CY2018	cmc	Amortization Acquired Unfavorable Contract Backlog AmortizationAcquiredUnfavorableContractBacklog	0	USD
CY2017	cmc	Amortization Acquired Unfavorable Contract Backlog AmortizationAcquiredUnfavorableContractBacklog	0	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	25106000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	23929000	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	700941000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	30311000	USD
CY2019	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	49523000	USD
CY2018	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	14377000	USD
CY2017	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-14184000	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	384000	USD
CY2018	us-gaap	Asset Impairment Charges AssetImpairmentCharges	15053000	USD
CY2017	us-gaap	Asset Impairment Charges AssetImpairmentCharges	8238000	USD
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	388000	USD
CY2018	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	2510000	USD
CY2017	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	6049000	USD
CY2019	us-gaap	Inventory Write Down InventoryWriteDown	723000	USD
CY2018	us-gaap	Inventory Write Down InventoryWriteDown	1407000	USD
CY2017	us-gaap	Inventory Write Down InventoryWriteDown	21529000	USD
CY2019	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	2281000	USD
CY2018	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	1322000	USD
CY2017	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-6049000	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2017	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-22672000	USD
CY2019	us-gaap	Amortization Of Deferred Hedge Gains AmortizationOfDeferredHedgeGains	0	USD
CY2018	us-gaap	Amortization Of Deferred Hedge Gains AmortizationOfDeferredHedgeGains	0	USD
CY2017	us-gaap	Amortization Of Deferred Hedge Gains AmortizationOfDeferredHedgeGains	-11657000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-27204000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	10802000	USD
CY2017	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	78527000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-89664000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	43198000	USD
CY2017	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	98835000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-15315000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-20163000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	93478000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	52851000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	15423000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	63785000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable From Securitization IncreaseDecreaseInAccountsReceivableFromSecuritization	367521000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable From Securitization IncreaseDecreaseInAccountsReceivableFromSecuritization	670457000	USD
CY2017	us-gaap	Increase Decrease In Accounts Receivable From Securitization IncreaseDecreaseInAccountsReceivableFromSecuritization	616017000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	37004000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-433924000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-523276000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	6980000	USD
CY2017	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	56080000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	138836000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	174655000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	213120000	USD
CY2019	us-gaap	Proceeds From Sale Of Equity Method Investments ProceedsFromSaleOfEquityMethodInvestments	1893000	USD
CY2018	us-gaap	Proceeds From Sale Of Equity Method Investments ProceedsFromSaleOfEquityMethodInvestments	75482000	USD
CY2017	us-gaap	Proceeds From Sale Of Equity Method Investments ProceedsFromSaleOfEquityMethodInvestments	163449000	USD
CY2019	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	4405000	USD
CY2018	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	27375000	USD
CY2017	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	0	USD
CY2019	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	3910000	USD
CY2018	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	8103000	USD
CY2017	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	3164000	USD
CY2019	cmc	Advances Under Accounts Receivable Programs AdvancesUnderAccountsReceivablePrograms	0	USD
CY2018	cmc	Advances Under Accounts Receivable Programs AdvancesUnderAccountsReceivablePrograms	226325000	USD
CY2017	cmc	Advances Under Accounts Receivable Programs AdvancesUnderAccountsReceivablePrograms	193432000	USD
CY2019	cmc	Repayments Under Accounts Receivable Programs RepaymentsUnderAccountsReceivablePrograms	0	USD
CY2018	cmc	Repayments Under Accounts Receivable Programs RepaymentsUnderAccountsReceivablePrograms	304178000	USD
CY2017	cmc	Repayments Under Accounts Receivable Programs RepaymentsUnderAccountsReceivablePrograms	111701000	USD
CY2019	cmc	Increase Decreasein Accounts Receivablefrom Securitization Investing Activities IncreaseDecreaseinAccountsReceivablefromSecuritizationInvestingActivities	-367521000	USD
CY2018	cmc	Increase Decreasein Accounts Receivablefrom Securitization Investing Activities IncreaseDecreaseinAccountsReceivablefromSecuritizationInvestingActivities	-670457000	USD
CY2017	cmc	Increase Decreasein Accounts Receivablefrom Securitization Investing Activities IncreaseDecreaseinAccountsReceivablefromSecuritizationInvestingActivities	-616017000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-462048000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	521929000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	595161000	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	180000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	350000000	USD
CY2017	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	475454000	USD
CY2019	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	288896000	USD
CY2018	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	0	USD
CY2017	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	0	USD
CY2019	cmc	Repayments Under Accounts Receivable Programs Financing Activities RepaymentsUnderAccountsReceivableProgramsFinancingActivities	296033000	USD
CY2018	cmc	Repayments Under Accounts Receivable Programs Financing Activities RepaymentsUnderAccountsReceivableProgramsFinancingActivities	0	USD
CY2017	cmc	Repayments Under Accounts Receivable Programs Financing Activities RepaymentsUnderAccountsReceivableProgramsFinancingActivities	0	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	127704000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	19967000	USD
CY2017	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	711850000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	56537000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	56076000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	55514000	USD
CY2019	cmc	Proceeds Paymentsfrom Issuanceof Sharesunder Incentiveand Sharebased Compensation Plans Including Tax Withholdings ProceedsPaymentsfromIssuanceofSharesunderIncentiveandSharebasedCompensationPlansIncludingTaxWithholdings	-1876000	USD
CY2018	cmc	Proceeds Paymentsfrom Issuanceof Sharesunder Incentiveand Sharebased Compensation Plans Including Tax Withholdings ProceedsPaymentsfromIssuanceofSharesunderIncentiveandSharebasedCompensationPlansIncludingTaxWithholdings	-9302000	USD
CY2017	cmc	Proceeds Paymentsfrom Issuanceof Sharesunder Incentiveand Sharebased Compensation Plans Including Tax Withholdings ProceedsPaymentsfromIssuanceofSharesunderIncentiveandSharebasedCompensationPlansIncludingTaxWithholdings	-5498000	USD
CY2019	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	0	USD
CY2018	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	0	USD
CY2017	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	22672000	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2018	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	5254000	USD
CY2017	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	4449000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	10000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	31000	USD
CY2017	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	36000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-13244000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	259432000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-324493000	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-598000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-703000	USD
CY2017	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-1213000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-438886000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	346734000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-253821000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	632615000	USD
CY2017Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	285881000	USD
CY2016Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	539702000	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
CY2017Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	285881000	USD
CY2019	us-gaap	Income Taxes Paid IncomeTaxesPaid	7977000	USD
CY2018	us-gaap	Income Taxes Paid IncomeTaxesPaid	7198000	USD
CY2017	us-gaap	Income Taxes Paid IncomeTaxesPaid	30963000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	65190000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	39972000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	65672000	USD
CY2019	cmc	Capital Lease Obligations Incurredandchangesinaccountspayablesrelatedtopropertyplantandequipment CapitalLeaseObligationsIncurredandchangesinaccountspayablesrelatedtopropertyplantandequipment	57640000	USD
CY2018	cmc	Capital Lease Obligations Incurredandchangesinaccountspayablesrelatedtopropertyplantandequipment CapitalLeaseObligationsIncurredandchangesinaccountspayablesrelatedtopropertyplantandequipment	32274000	USD
CY2017	cmc	Capital Lease Obligations Incurredandchangesinaccountspayablesrelatedtopropertyplantandequipment CapitalLeaseObligationsIncurredandchangesinaccountspayablesrelatedtopropertyplantandequipment	51330000	USD
CY2016Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1367431000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	46332000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	31401000	USD
CY2017	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	55514000	USD
CY2017	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-5373000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	15001000	USD
CY2017	us-gaap	Proceeds From Payments To Minority Shareholders ProceedsFromPaymentsToMinorityShareholders	14000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Restricted Stock Units Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition	1638000	USD
CY2017Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1400930000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	138506000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-12164000	USD
CY2018	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	56076000	USD
CY2018	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-9301000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	16168000	USD
CY2018	us-gaap	Proceeds From Payments To Minority Shareholders ProceedsFromPaymentsToMinorityShareholders	13000	USD
CY2018	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Effect Of Adoption Quantification NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification	259000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Restricted Stock Units Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition	15248000	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	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
CY2019	us-gaap	Cumulative Effect On Retained Earnings Net Of Tax1 CumulativeEffectOnRetainedEarningsNetOfTax1	-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
CY2019	us-gaap	Nature Of Operations NatureOfOperations	<div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-weight:bold;">NOTE 1. NATURE OF OPERATIONS</span><span style="font-family:inherit;font-size:10pt;font-weight:bold;"> </span></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-weight:bold;">Nature of Operations</span><span style="font-family:inherit;font-size:10pt;"> </span></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">As a vertically integrated organization, Commercial Metals Company ("CMC," and together with its consolidated subsidiaries, the "Company") manufactures, recycles, and markets steel and metal products, related materials and services through a network including </span><span style="font-family:inherit;font-size:10pt;"><span>eight</span></span><span style="font-family:inherit;font-size:10pt;"> </span><span style="font-family:inherit;font-size:10pt;">electric arc furnace ("EAF") mini mills</span><span style="font-family:inherit;font-size:10pt;">, </span><span style="font-family:inherit;font-size:10pt;"><span>two</span></span><span style="font-family:inherit;font-size:10pt;"> </span><span style="font-family:inherit;font-size:10pt;">EAF micro mills</span><span style="font-family:inherit;font-size:10pt;">, a </span><span style="font-family:inherit;font-size:10pt;">rerolling mill</span><span style="font-family:inherit;font-size:10pt;">, </span><span style="font-family:inherit;font-size:10pt;">steel fabrication and processing plants</span><span style="font-family:inherit;font-size:10pt;">, </span><span style="font-family:inherit;font-size:10pt;">construction-related product warehouses</span><span style="font-family:inherit;font-size:10pt;"> and </span><span style="font-family:inherit;font-size:10pt;">metal recycling facilities</span><span style="font-family:inherit;font-size:10pt;"> in the United States ("U.S.") and Poland.</span></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The Company has </span><span style="font-family:inherit;font-size:10pt;"><span>four</span></span><span style="font-family:inherit;font-size:10pt;"> reportable segments: </span><span style="font-family:inherit;font-size:10pt;">Americas Recycling</span><span style="font-family:inherit;font-size:10pt;">, </span><span style="font-family:inherit;font-size:10pt;">Americas Mills</span><span style="font-family:inherit;font-size:10pt;">, </span><span style="font-family:inherit;font-size:10pt;">Americas Fabrication</span><span style="font-family:inherit;font-size:10pt;"> and </span><span style="font-family:inherit;font-size:10pt;">International Mill</span><span style="font-family:inherit;font-size:10pt;">.</span></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-weight:bold;">Americas Recycling</span><span style="font-family:inherit;font-size:10pt;"> </span></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The Americas Recycling segment processes scrap metals for use as a raw material by manufacturers of new metal products. This segment sells scrap metals to steel mills and foundries, aluminum sheet and ingot manufacturers, brass and bronze ingot makers, copper refineries and mills, secondary lead smelters, specialty steel mills, high temperature alloy manufacturers and other consumers. </span></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-weight:bold;">Americas Mills</span><span style="font-family:inherit;font-size:10pt;font-weight:bold;"> </span></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The Americas Mills segment, through its </span><span style="font-family:inherit;font-size:10pt;"><span>seven</span></span><span style="font-family:inherit;font-size:10pt;"> </span><span style="font-family:inherit;font-size:10pt;">EAF mini mills</span><span style="font-family:inherit;font-size:10pt;">, </span><span style="font-family:inherit;font-size:10pt;"><span>two</span></span><span style="font-family:inherit;font-size:10pt;"> </span><span style="font-family:inherit;font-size:10pt;">EAF micro mills</span><span style="font-family:inherit;font-size:10pt;"> and </span><span style="font-family:inherit;font-size:10pt;">rerolling mill</span><span style="font-family:inherit;font-size:10pt;">, manufactures finished long steel products including reinforcing bar ("rebar"), merchant bar, light structural and other special sections as well as semi-finished billets for re-rolling and forging applications. This segment's products are sold to the construction, service center, transportation, steel warehousing, fabrication, energy, petrochemical and original equipment manufacturing industries. The Americas Mills segment also includes </span><span style="font-family:inherit;font-size:10pt;"><span>eight</span></span><span style="font-family:inherit;font-size:10pt;"> </span><span style="font-family:inherit;font-size:10pt;font-weight:normal;">scrap metal processing facilities</span><span style="font-family:inherit;font-size:10pt;"> and </span><span style="font-family:inherit;font-size:10pt;"><span>two</span></span><span style="font-family:inherit;font-size:10pt;"> </span><span style="font-family:inherit;font-size:10pt;font-weight:normal;">scrap metal shredders</span><span style="font-family:inherit;font-size:10pt;"> that directly support the steel mills.</span></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-weight:bold;">Americas Fabrication</span><span style="font-family:inherit;font-size:10pt;"> </span></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The Americas Fabrication segment consists of the Company's rebar fabrication operations, fence post manufacturing facilities, construction-related product facilities and facilities that heat-treat steel to strengthen and provide flexibility. Fabricated steel products are used primarily in the construction of commercial and non-commercial buildings, hospitals, convention centers, industrial plants, power plants, highways, bridges, arenas, stadiums and dams. </span></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-weight:bold;">International Mill</span><span style="font-family:inherit;font-size:10pt;font-weight:bold;"> </span></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div>The International Mill segment is comprised of the Company's EAF mini mill, recycling and fabrication operations in Poland. This segment manufactures rebar, merchant bar and wire rod as well as semi-finished billets. In addition, this segment's fabrication operations sell fabricated rebar, fabricated mesh, assembled rebar cages and other rebar by-products. The International Mill's products are sold primarily to fabricators, manufacturers, distributors and construction companies.
CY2019Q3	cmc	Numberof Electric Arc Furnace Mini Mills NumberofElectricArcFurnaceMiniMills	8	mini_mill
CY2019Q3	cmc	Numberof Electric Arc Furnace Micro Mills NumberofElectricArcFurnaceMicroMills	2	micro_mill
CY2019	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	4	segments
CY2019Q3	cmc	Numberof Electric Arc Furnace Micro Mills NumberofElectricArcFurnaceMicroMills	2	micro_mill
CY2019	us-gaap	Use Of Estimates UseOfEstimates	<div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-weight:bold;">Use of Estimates</span><span style="font-family:inherit;font-size:10pt;"> </span></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">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 the valuation of assets acquired and liabilities assumed in acquisitions; the carrying value of inventory and long-lived assets, including goodwill; valuation allowances for receivables and deferred income taxes; revenue recognized over time; share-based compensation; potential litigation claims and settlements; environmental liabilities; and the carrying value of assets held for sale. Actual results could differ significantly from these estimates and assumptions.</span></div>
CY2019	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	5829002000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	198093000	USD
CY2018Q4	cmc	Numberof Rebar Fabrication Facilities NumberofRebarFabricationFacilities	33	fabrication_facility
CY2018Q4	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	701200000	USD
	cmc	Business Combination Inventory Step Up BusinessCombinationInventoryStepUp	10300000	USD
CY2018Q4	cmc	Business Combination Recognized Identifiable Assets Acquiredand Liabilities Assumed Pensionand Postretirement Liabilities BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedPensionandPostretirementLiabilities	6400000	USD
CY2019Q2	us-gaap	Business Combination Pro Forma Information Revenue Of Acquiree Since Acquisition Date Actual BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual	1379455000	USD
CY2019Q2	us-gaap	Business Combination Pro Forma Information Earnings Or Loss Of Acquiree Since Acquisition Date Actual BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual	132733000	USD
CY2019Q2	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	6033908000	USD
CY2018Q2	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	6303812000	USD
CY2019Q2	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	162255000	USD
CY2018Q2	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	105377000	USD
CY2018Q2	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	51700000	USD
CY2019	us-gaap	Severance Costs1 SeveranceCosts1	900000	USD
CY2018	us-gaap	Severance Costs1 SeveranceCosts1	6700000	USD
CY2017	us-gaap	Severance Costs1 SeveranceCosts1	17500000	USD
CY2016Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-112914000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Before Reclassifications Before Tax OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax	32190000	USD
CY2017	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax	762000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	27000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	31401000	USD
CY2017Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-81513000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Before Reclassifications Before Tax OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax	-14454000	USD
CY2018	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax	-2563000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	273000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-12164000	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
CY2018	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	4643723000	USD
CY2019Q3	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	103805000	USD
CY2018Q3	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	49221000	USD
CY2019Q3	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	37165000	USD
CY2018Q3	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	6679000	USD
CY2019Q3	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	809500000	USD
CY2019Q3	us-gaap	Revenue Remaining Performance Obligation Percentage RevenueRemainingPerformanceObligationPercentage	0.40	pure
CY2019Q3	us-gaap	Revenue Remaining Performance Obligation Percentage RevenueRemainingPerformanceObligationPercentage	0.49	pure
CY2019Q3	us-gaap	Revenue Remaining Performance Obligation Percentage RevenueRemainingPerformanceObligationPercentage	0.11	pure
CY2019	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	5829002000	USD
CY2017	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	3844069000	USD
CY2019Q3	us-gaap	Inventory Raw Materials InventoryRawMaterials	143700000	USD
CY2018Q3	us-gaap	Inventory Raw Materials InventoryRawMaterials	177700000	USD
CY2017	us-gaap	Inventory Write Down InventoryWriteDown	21500000	USD
CY2017Q3	us-gaap	Goodwill Gross GoodwillGross	77310000	USD
CY2018	cmc	Goodwill Acquired During Period Gross GoodwillAcquiredDuringPeriodGross	-819000	USD
CY2018	cmc	Goodwill Gross Reclassificationto Assetsof Discontinued Operations GoodwillGrossReclassificationtoAssetsofDiscontinuedOperations	1982000	USD
CY2018Q3	us-gaap	Goodwill Gross GoodwillGross	74509000	USD
CY2019	cmc	Goodwill Gross Foreign Currency Translation Gain Loss GoodwillGrossForeignCurrencyTranslationGainLoss	-184000	USD
CY2019Q3	us-gaap	Goodwill Gross GoodwillGross	74325000	USD
CY2017Q3	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	12395000	USD
CY2018	cmc	Goodwill Impairment Dispositions GoodwillImpairmentDispositions	214000	USD
CY2018	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	1982000	USD
CY2018Q3	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	10199000	USD
CY2019	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	-172000	USD
CY2019Q3	us-gaap	Goodwill Goodwill	64138000	USD
CY2019	cmc	Goodwill Impairment Dispositions GoodwillImpairmentDispositions	12000	USD
CY2019Q3	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	10187000	USD
CY2017Q3	us-gaap	Goodwill Goodwill	64915000	USD
CY2019Q3	cmc	Current Maturitiesand Short Term Borrowings CurrentMaturitiesandShortTermBorrowings	17439000	USD
CY2018Q3	cmc	Current Maturitiesand Short Term Borrowings CurrentMaturitiesandShortTermBorrowings	19746000	USD
CY2018	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	-605000	USD
CY2018Q3	us-gaap	Goodwill Goodwill	64310000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	20766000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	7454000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	13312000	USD
CY2018Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	20502000	USD
CY2018Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	6480000	USD
CY2018Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	14022000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2200000	USD
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2100000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	2047000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	2025000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	1748000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	1289000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	1252000	USD
CY2019Q3	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	1254921000	USD
CY2018Q3	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	1170129000	USD
CY2019Q3	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	10268000	USD
CY2018Q3	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	11764000	USD
CY2019Q3	cmc	Longterm Debtand Capital Lease Obligations Net LongtermDebtandCapitalLeaseObligationsNet	1244653000	USD
CY2018Q3	cmc	Longterm Debtand Capital Lease Obligations Net LongtermDebtandCapitalLeaseObligationsNet	1158365000	USD
CY2019Q3	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	13510000	USD
CY2018Q3	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	19746000	USD
CY2019Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	3929000	USD
CY2018Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	0	USD
CY2019Q3	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	1227214000	USD
CY2018Q3	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	1138619000	USD
CY2019Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	17439000	USD
CY2019Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	10827000	USD
CY2019Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	219049000	USD
CY2019Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	337264000	USD
CY2019Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	7717000	USD
CY2019Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	662625000	USD
CY2019Q3	cmc	Total Debt Excluding Hedge Accounting Adjustment TotalDebtExcludingHedgeAccountingAdjustment	1254921000	USD
CY2019Q3	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	10268000	USD
CY2019Q3	cmc	Longterm Debtand Capital Lease Obligations Net LongtermDebtandCapitalLeaseObligationsNet	1244653000	USD
CY2019	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	300000	USD
CY2018	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	7300000	USD
CY2017	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	9800000	USD
CY2019	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	1173000	USD
CY2018	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	7103000	USD
CY2017	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	-14542000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	194986000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	86731000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	25506000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	73474000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	78653000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	39945000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	268460000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	165384000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	65451000	USD
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CY2018	cmc	Current Federal Tax Expense Benefit From Continuing And Discontinued Operations CurrentFederalTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	20210000	USD
CY2017	cmc	Current Federal Tax Expense Benefit From Continuing And Discontinued Operations CurrentFederalTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	11345000	USD
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CY2017	cmc	Deferred Foreign Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredForeignIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	-917000	USD
CY2019	cmc	Deferred State And Local Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredStateAndLocalIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	4908000	USD
CY2018	cmc	Deferred State And Local Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredStateAndLocalIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	1002000	USD
CY2017	cmc	Deferred State And Local Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredStateAndLocalIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	281000	USD
CY2019	cmc	Deferred Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	52320000	USD
CY2018	cmc	Current Foreign Tax Expense Benefit From Continuing And Discontinued Operations CurrentForeignTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	18308000	USD
CY2017	cmc	Current Foreign Tax Expense Benefit From Continuing And Discontinued Operations CurrentForeignTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	9464000	USD
CY2019	cmc	Current State And Local Tax Expense Benefit From Continuing And Discontinued Operations CurrentStateAndLocalTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	2892000	USD
CY2018	cmc	Current State And Local Tax Expense Benefit From Continuing And Discontinued Operations CurrentStateAndLocalTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	2263000	USD
CY2017	cmc	Current State And Local Tax Expense Benefit From Continuing And Discontinued Operations CurrentStateAndLocalTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	2654000	USD
CY2019	cmc	Current Income Tax Expense Benefit From Continuing And Discontinued Operations CurrentIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	17519000	USD
CY2018	cmc	Current Income Tax Expense Benefit From Continuing And Discontinued Operations CurrentIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	40781000	USD
CY2017	cmc	Current Income Tax Expense Benefit From Continuing And Discontinued Operations CurrentIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	23463000	USD
CY2019	cmc	Deferred Federal Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredFederalIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	46922000	USD
CY2018	cmc	Deferred Federal Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredFederalIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	-11501000	USD
CY2017	cmc	Deferred Federal Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredFederalIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	-13548000	USD
CY2019	cmc	Deferred Foreign Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredForeignIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	490000	USD
CY2018	cmc	Deferred Foreign Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredForeignIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	-169000	USD
CY2018	cmc	Deferred Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	-10668000	USD
CY2017	cmc	Deferred Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	-14184000	USD
CY2019	cmc	Income Tax Expense Benefit From Continuing And Discontinued Operations IncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	69839000	USD
CY2018	cmc	Income Tax Expense Benefit From Continuing And Discontinued Operations IncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	30113000	USD
CY2017	cmc	Income Tax Expense Benefit From Continuing And Discontinued Operations IncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	9279000	USD
CY2019	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	158000	USD
CY2018	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	-34000	USD
CY2017	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	-5997000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	69681000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	30147000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	15276000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210	pure
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.257	pure
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350	pure
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	56377000	USD
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	42471000	USD
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	22908000	USD
CY2019	cmc	Effective Income Tax Rate Reconciliation Toll Chargeand Related Foreign Tax Credits EffectiveIncomeTaxRateReconciliationTollChargeandRelatedForeignTaxCredits	7410000	USD
CY2018	cmc	Effective Income Tax Rate Reconciliation Toll Chargeand Related Foreign Tax Credits EffectiveIncomeTaxRateReconciliationTollChargeandRelatedForeignTaxCredits	29466000	USD
CY2017	cmc	Effective Income Tax Rate Reconciliation Toll Chargeand Related Foreign Tax Credits EffectiveIncomeTaxRateReconciliationTollChargeandRelatedForeignTaxCredits	0	USD
CY2019	cmc	Effective Income Tax Rate Reconciliation Remeasurementof Deferred Tax Balances EffectiveIncomeTaxRateReconciliationRemeasurementofDeferredTaxBalances	586000	USD
CY2018	cmc	Effective Income Tax Rate Reconciliation Remeasurementof Deferred Tax Balances EffectiveIncomeTaxRateReconciliationRemeasurementofDeferredTaxBalances	25515000	USD
CY2017	cmc	Effective Income Tax Rate Reconciliation Remeasurementof Deferred Tax Balances EffectiveIncomeTaxRateReconciliationRemeasurementofDeferredTaxBalances	0	USD
CY2019	cmc	Effective Income Tax Rate Reconciliation Impairmenton Valuationof Subsidiaries EffectiveIncomeTaxRateReconciliationImpairmentonValuationofSubsidiaries	29697000	USD
CY2018	cmc	Effective Income Tax Rate Reconciliation Impairmenton Valuationof Subsidiaries EffectiveIncomeTaxRateReconciliationImpairmentonValuationofSubsidiaries	-22315000	USD
CY2017	cmc	Effective Income Tax Rate Reconciliation Impairmenton Valuationof Subsidiaries EffectiveIncomeTaxRateReconciliationImpairmentonValuationofSubsidiaries	92321000	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Restructuring Charges IncomeTaxReconciliationNondeductibleExpenseRestructuringCharges	0	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Restructuring Charges IncomeTaxReconciliationNondeductibleExpenseRestructuringCharges	18926000	USD
CY2017	us-gaap	Income Tax Reconciliation Nondeductible Expense Restructuring Charges IncomeTaxReconciliationNondeductibleExpenseRestructuringCharges	0	USD
CY2019	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	36167000	USD
CY2018	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-20839000	USD
CY2017	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	113135000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	9799000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	17414000	USD
CY2017	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	19259000	USD
CY2019	cmc	Effective Tax Rate Reconciliation Worthless Stock Amount EffectiveTaxRateReconciliationWorthlessStockAmount	0	USD
CY2018	cmc	Effective Tax Rate Reconciliation Worthless Stock Amount EffectiveTaxRateReconciliationWorthlessStockAmount	-6084000	USD
CY2017	cmc	Effective Tax Rate Reconciliation Worthless Stock Amount EffectiveTaxRateReconciliationWorthlessStockAmount	0	USD
CY2019	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-1466000	USD
CY2018	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-5973000	USD
CY2017	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-7518000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	580000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	4707000	USD
CY2017	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	1034000	USD
CY2019	cmc	Incometaxreconciliationtaxreorganization Incometaxreconciliationtaxreorganization	120000	USD
CY2018	cmc	Incometaxreconciliationtaxreorganization Incometaxreconciliationtaxreorganization	-3187000	USD
CY2017	cmc	Incometaxreconciliationtaxreorganization Incometaxreconciliationtaxreorganization	-659000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	6085000	USD
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	2317000	USD
CY2017	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1490000	USD
CY2019	cmc	Effective Income Tax Rate Reconciliationdeferredcompensation EffectiveIncomeTaxRateReconciliationdeferredcompensation	-395000	USD
CY2018	cmc	Effective Income Tax Rate Reconciliationdeferredcompensation EffectiveIncomeTaxRateReconciliationdeferredcompensation	-2036000	USD
CY2017	cmc	Effective Income Tax Rate Reconciliationdeferredcompensation EffectiveIncomeTaxRateReconciliationdeferredcompensation	-2101000	USD
CY2019	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	0	USD
CY2018	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	0	USD
CY2017	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	1407000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	6045000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	407000	USD
CY2017	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	2042000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	69681000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	30147000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	15276000	USD
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.260	pure
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.182	pure
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.233	pure
CY2019Q3	us-gaap	Undistributed Earnings Of Foreign Subsidiaries UndistributedEarningsOfForeignSubsidiaries	623500000	USD
CY2017	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	-6000000.0	USD
CY2019Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	295241000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	285847000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	24432000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	21333000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Other DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther	40296000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Other DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther	12704000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	2537000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	2258000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	8446000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	974000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	480000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	906000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	10600000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	469000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	382032000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	324491000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	283560000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	268554000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	98472000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	55937000	USD
CY2019Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	168701000	USD
CY2018Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	83879000	USD
CY2019Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	1182000	USD
CY2018Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	1053000	USD
CY2019Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	169883000	USD
CY2018Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	84932000	USD
CY2019Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	71411000	USD
CY2018Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	28995000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	1255000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2018Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	3121000	USD
CY2017Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	9283000	USD
CY2016Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	9522000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	5531000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	3121000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	8028000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	239000	USD
CY2019Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	8652000	USD
CY2018Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	3121000	USD
CY2017Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	9283000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	25100000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	23900000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	30300000	USD
CY2019Q3	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	15900000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P3Y
CY2019Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	8021005	shares
CY2019Q3	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	-8226000	USD
CY2019Q3	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	2823000	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
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	30300000	USD
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	24400000	USD
CY2018Q3	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	0	USD
CY2019	us-gaap	Defined Benefit Plan Business Combinations And Acquisitions Benefit Obligation DefinedBenefitPlanBusinessCombinationsAndAcquisitionsBenefitObligation	26336000	USD
CY2019	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	354000	USD
CY2019	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	926000	USD
CY2019	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	4883000	USD
CY2019	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	838000	USD
CY2019Q3	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	31661000	USD
CY2018Q3	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	0	USD
CY2019	us-gaap	Defined Benefit Plan Business Combinations And Acquisitions Plan Assets DefinedBenefitPlanBusinessCombinationsAndAcquisitionsPlanAssets	21023000	USD
CY2019	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	2887000	USD
CY2019	us-gaap	Defined Benefit Plan Administration Expenses DefinedBenefitPlanAdministrationExpenses	69000	USD
CY2019	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	432000	USD
CY2019	us-gaap	Defined Benefit Plan Plan Assets Benefits Paid DefinedBenefitPlanPlanAssetsBenefitsPaid	838000	USD
CY2019Q3	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	23435000	USD
CY2019Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	8146000	USD
CY2019	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	522000	USD
CY2019	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-2823000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	2823000	USD
CY2019	us-gaap	Amount Recognized In Net Periodic Benefit Cost And Other Comprehensive Income Loss Before Tax AmountRecognizedInNetPeriodicBenefitCostAndOtherComprehensiveIncomeLossBeforeTax	3345000	USD
CY2019Q3	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.032	pure
CY2019	cmc	Defined Benefit Plan Effective Interest Rateon Benefit Obligations DefinedBenefitPlanEffectiveInterestRateonBenefitObligations	0.043	pure
CY2019	cmc	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Effective Ratefor Service Cost DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostEffectiveRateforServiceCost	0.047	pure
CY2019	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.060	pure
CY2019	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.06	pure
CY2019Q3	cmc	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Longterm Rateof Returnon Plan Assets Year Two DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongtermRateofReturnonPlanAssetsYearTwo	0.06	pure
CY2019Q3	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1.000	pure
CY2019Q3	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	23435000	USD
CY2019Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	1265000	USD
CY2019Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Two DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	1343000	USD
CY2019Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Three DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	1408000	USD
CY2019Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Four DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	1464000	USD
CY2019Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	1515000	USD
CY2018	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2017	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2014Q4	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	100000000.0	USD
CY2019Q3	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	27600000	USD
CY2019Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000000	shares
CY2019Q3	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1.00
CY2019Q3	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2019	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	198779000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	135237000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	50175000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	117834558	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	116822583	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	115654466	shares
CY2019	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.69
CY2018	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.16
CY2017	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.43
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	117834558	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	116822583	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	115654466	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1290070	shares
CY2018	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1323265	shares
CY2017	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1709942	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	119124628	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	118145848	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	117364408	shares
CY2019	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.67
CY2018	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.14
CY2017	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.43
CY2019Q3	us-gaap	Accrued Salaries Current AccruedSalariesCurrent	133705000	USD
CY2018Q3	us-gaap	Accrued Salaries Current AccruedSalariesCurrent	106123000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	34511000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	27383000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	22074000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	17433000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	10478000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	12938000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	124817000	USD
CY2019	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	58200000	USD
CY2018	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	38000000.0	USD
CY2017	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	37300000	USD
CY2019Q3	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	3600000	USD
CY2018Q3	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	4000000.0	USD
CY2019Q3	us-gaap	Accrued Environmental Loss Contingencies Noncurrent AccruedEnvironmentalLossContingenciesNoncurrent	1800000	USD
CY2018Q3	us-gaap	Accrued Environmental Loss Contingencies Noncurrent AccruedEnvironmentalLossContingenciesNoncurrent	1900000	USD
CY2019Q3	us-gaap	Billed Contract Receivables BilledContractReceivables	41631000	USD
CY2018Q3	us-gaap	Billed Contract Receivables BilledContractReceivables	7109000	USD
CY2019Q3	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	38660000	USD
CY2018Q3	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	26946000	USD
CY2019Q3	us-gaap	Accrued Insurance Current AccruedInsuranceCurrent	38485000	USD
CY2018Q3	us-gaap	Accrued Insurance Current AccruedInsuranceCurrent	23462000	USD
CY2017	cmc	Asset Impairment Charges From Continuing Operations AssetImpairmentChargesFromContinuingOperations	1730000	USD
CY2019	cmc	Adjusted Operating Profit Loss From Continuing Operation AdjustedOperatingProfitLossFromContinuingOperation	424085000	USD
CY2019	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	4	segments
CY2019	cmc	Depreciation Amortization And Asset Impairment Charges DepreciationAmortizationAndAssetImpairmentCharges	158652000	USD
CY2018	cmc	Depreciation Amortization And Asset Impairment Charges DepreciationAmortizationAndAssetImpairmentCharges	131508000	USD
CY2017	cmc	Depreciation Amortization And Asset Impairment Charges DepreciationAmortizationAndAssetImpairmentCharges	124490000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	198779000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	135237000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	50175000	USD
CY2019	us-gaap	Interest Expense InterestExpense	71373000	USD
CY2018	us-gaap	Interest Expense InterestExpense	40957000	USD
CY2017	us-gaap	Interest Expense InterestExpense	44151000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	69681000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	30147000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	15276000	USD
CY2019	cmc	Depreciation Amortization And Asset Impairment Charges DepreciationAmortizationAndAssetImpairmentCharges	158652000	USD
CY2018	cmc	Depreciation Amortization And Asset Impairment Charges DepreciationAmortizationAndAssetImpairmentCharges	131508000	USD
CY2017	cmc	Depreciation Amortization And Asset Impairment Charges DepreciationAmortizationAndAssetImpairmentCharges	124490000	USD
CY2019	cmc	Amortization Acquired Unfavorable Contract Backlog AmortizationAcquiredUnfavorableContractBacklog	74784000	USD
CY2018	cmc	Amortization Acquired Unfavorable Contract Backlog AmortizationAcquiredUnfavorableContractBacklog	0	USD
CY2017	cmc	Amortization Acquired Unfavorable Contract Backlog AmortizationAcquiredUnfavorableContractBacklog	0	USD
CY2019	cmc	Asset Impairment Charges From Continuing Operations AssetImpairmentChargesFromContinuingOperations	384000	USD
CY2018	cmc	Asset Impairment Charges From Continuing Operations AssetImpairmentChargesFromContinuingOperations	14372000	USD
CY2018	cmc	Adjusted Operating Profit Loss From Continuing Operation AdjustedOperatingProfitLossFromContinuingOperation	352221000	USD
CY2017	cmc	Adjusted Operating Profit Loss From Continuing Operation AdjustedOperatingProfitLossFromContinuingOperation	235822000	USD
CY2019	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	5829002000	USD
CY2018	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	4643723000	USD
CY2017	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	3844069000	USD
CY2019Q3	us-gaap	Noncurrent Assets NoncurrentAssets	1599218000	USD
CY2018Q3	us-gaap	Noncurrent Assets NoncurrentAssets	1172607000	USD
CY2017Q3	us-gaap	Noncurrent Assets NoncurrentAssets	1159876000	USD
CY2018Q4	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1277342000	USD
CY2019Q1	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1402783000	USD
CY2019Q2	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1605872000	USD
CY2019Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1543005000	USD
CY2018Q4	us-gaap	Gross Profit GrossProfit	158909000	USD
CY2019Q1	us-gaap	Gross Profit GrossProfit	150290000	USD
CY2019Q2	us-gaap	Gross Profit GrossProfit	241630000	USD
CY2019Q3	us-gaap	Gross Profit GrossProfit	252659000	USD
CY2018Q4	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	19420000	USD
CY2019Q1	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	14928000	USD
CY2019Q2	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	78551000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	85880000	USD
CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	19742000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	13850000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	78390000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	86111000	USD
CY2018Q4	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.17
CY2019Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.13
CY2018Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.44
CY2019Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.67
CY2019Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.73
CY2018Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.16
CY2019Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.13
CY2019Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.66
CY2019Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.72
CY2018Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.17
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.12
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.66
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.73
CY2018Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.17
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.12
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.66
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.72
CY2017Q4	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1076533000	USD
CY2018Q1	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1054268000	USD
CY2018Q2	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1204484000	USD
CY2018Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1308438000	USD
CY2017Q4	us-gaap	Gross Profit GrossProfit	143017000	USD
CY2018Q1	us-gaap	Gross Profit GrossProfit	127167000	USD
CY2018Q2	us-gaap	Gross Profit GrossProfit	168570000	USD
CY2018Q3	us-gaap	Gross Profit GrossProfit	183411000	USD
CY2017Q4	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	31871000	USD
CY2018Q1	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	9781000	USD
CY2018Q2	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	42325000	USD
CY2018Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	51260000	USD
CY2017Q4	us-gaap	Net Income Loss NetIncomeLoss	36810000	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	10169000	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	39965000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	51560000	USD
CY2017Q4	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.27
CY2018Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.08
CY2018Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.36
CY2017Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.27
CY2018Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.08
CY2018Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.36
CY2018Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.43
CY2017Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.32
CY2018Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.09
CY2018Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.34
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.44
CY2017Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.31
CY2018Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.09
CY2018Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.34
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.44

Files In Submission

Name	View Source	Status
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$CMC
COMMERCIAL METALS Co Stock $cmc

2018 Q3 Form 10-K Financial Statement

#000002244419000042 Filed on October 23, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CMC COMMERCIAL METALS Co Stock $cmc

2018 Q3 Form 10-K Financial Statement

#000002244419000042 Filed on October 23, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CMC
COMMERCIAL METALS Co Stock $cmc