$BXC
BlueLinx Holdings Inc. Stock $bxc

$bxc Overview Financials Valuation SEC Filings Company Website

2021 Q1 Form 10-K Financial Statement

#000130178721000013 Filed on March 03, 2021

Income Statement

Concept	2021 Q1	2021	2019 Q4
Revenue	$865.4M	$3.097B	$613.5M
YoY Change	30.71%	0.0%	-8.79%
Cost Of Revenue	$741.2M	$2.620B	$530.5M
YoY Change	30.3%	0.0%	-10.31%
Gross Profit	$124.2M	$477.7M	$83.00M
YoY Change	33.25%	0.01%	2.34%
Gross Profit Margin	14.35%	15.42%	13.53%
Selling, General & Admin	$91.90M	$314.2M	$76.20M
YoY Change	23.21%	0.01%	-5.58%
% of Gross Profit	73.99%	65.77%	91.81%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$7.100M	$28.90M	$30.20M
YoY Change	-7.01%	0.0%	297.37%
% of Gross Profit	5.72%	6.05%	36.39%
Operating Expenses	$95.10M	$335.5M	$84.00M
YoY Change	12.04%	-3.04%	-4.87%
Operating Profit	$29.10M	$142.2M	-$1.000M
YoY Change	249.34%	8.0%	-86.11%
Interest Expense	-$10.70M	$47.41M	-$13.70M
YoY Change	-174.41%	-200.03%	2.24%
% of Operating Profit	-36.77%	33.33%
Other Income/Expense, Net	$200.0K	$254.0K	-$2.800M
YoY Change	-15.61%	-15.33%	-2900.0%
Pretax Income	$19.80M	$95.08M	-$14.20M
YoY Change	-440.62%	-0.02%	-30.39%
Income Tax	$0.00	$14.20M	-$4.000M
% Of Pretax Income	0.0%	14.93%
Net Earnings	$19.90M	$80.88M	-$10.20M
YoY Change	-2628.59%	-0.02%	-37.04%
Net Earnings / Revenue	2.3%	2.61%	-1.66%
Basic Earnings Per Share		$8.58
Diluted Earnings Per Share	$2.073M	$8.55	-$1.085M
COMMON SHARES
Basic Shares Outstanding	9.468M shares	9.422M shares	9.365M shares
Diluted Shares Outstanding		9.463M shares

Balance Sheet

Concept	2021 Q1	2021	2019 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$100.0K	$100.0K	$11.60M
YoY Change	-99.21%	0.0%	30.34%
Cash & Equivalents	$82.00K		$11.64M
Short-Term Investments
Other Short-Term Assets	$32.58M	$32.60M	$27.72M
YoY Change	23.24%	0.0%	-31.78%
Inventory	$342.1M	$342.1M	$345.8M
Prepaid Expenses
Receivables	$293.6M	$293.6M	$192.9M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$668.4M	$668.4M	$578.0M
YoY Change	0.43%	0.0%	-3.64%
LONG-TERM ASSETS
Property, Plant & Equipment	$229.9M	$229.9M	$250.2M
YoY Change	-5.7%	0.0%	21.98%
Goodwill	$47.77M		$47.77M
YoY Change	-0.06%		0.0%
Intangibles	$18.89M		$26.38M
YoY Change	-22.63%		-25.09%
Long-Term Investments
YoY Change
Other Assets	$20.30M	$83.20M	$15.06M
YoY Change	-0.5%	0.0%	-21.9%
Total Long-Term Assets	$379.7M	$379.7M	$393.4M
YoY Change	-4.03%	0.0%	9.26%
TOTAL ASSETS
Total Short-Term Assets	$668.4M	$668.4M	$578.0M
Total Long-Term Assets	$379.7M	$379.7M	$393.4M
Total Assets	$1.048B	$1.048B	$971.4M
YoY Change	-1.23%	0.0%	1.2%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$165.2M	$165.2M	$132.3M
YoY Change	1.7%	0.0%	-11.29%
Accrued Expenses	$30.80M	$30.80M	$15.00M
YoY Change	102.63%	0.0%	-52.68%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change			-100.0%
Long-Term Debt Due	$1.171M	$6.800M	$2.176M
YoY Change	-46.19%	0.0%	25.35%
Total Short-Term Liabilities	$229.0M	$229.0M	$171.1M
YoY Change	14.76%	0.0%	-13.03%
LONG-TERM LIABILITIES
Long-Term Debt	$321.3M	$588.7M	$458.4M
YoY Change	-27.79%	0.0%	-7.93%
Other Long-Term Liabilities	$25.64M	$171.3M	$24.02M
YoY Change	6.34%	0.0%	1.45%
Total Long-Term Liabilities	$346.9M	$760.0M	$482.5M
YoY Change	-26.04%	0.0%	-7.51%
TOTAL LIABILITIES
Total Short-Term Liabilities	$229.0M	$229.0M	$171.1M
Total Long-Term Liabilities	$346.9M	$760.0M	$482.5M
Total Liabilities	$989.0M	$989.0M	$997.5M
YoY Change	-9.0%	0.0%	2.36%
SHAREHOLDERS EQUITY
Retained Earnings	-$171.7M		-$252.6M
YoY Change	-32.23%		6.93%
Common Stock	$266.8M		$261.1M
YoY Change	1.8%		0.92%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$59.09M	$59.10M	-$26.08M
YoY Change
Total Liabilities & Shareholders Equity	$1.048B	$1.048B	$971.4M
YoY Change	-1.23%	0.0%	1.2%

Cashflow Statement

Concept	2021 Q1	2021	2019 Q4
OPERATING ACTIVITIES
Net Income	$19.90M	$80.88M	-$10.20M
YoY Change	-2628.59%	-0.02%	-37.04%
Depreciation, Depletion And Amortization	$7.100M	$28.90M	$30.20M
YoY Change	-7.01%	0.0%	297.37%
Cash From Operating Activities	-$19.40M	$55.02M	$44.60M
YoY Change	-67.22%	0.03%	-55.8%
INVESTING ACTIVITIES
Capital Expenditures	-$1.800M	$3.689M	-$1.500M
YoY Change	-244.58%	-0.3%	87.5%
Acquisitions		$0.00
YoY Change
Other Investing Activities	$2.100M	$12.80M	$12.20M
YoY Change		0.0%	139.22%
Cash From Investing Activities	$400.0K	$9.160M	$10.70M
YoY Change	-133.31%	-0.43%	148.84%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	9.000M	-$75.74M	-56.60M
YoY Change	-85.32%	0.05%	-45.47%
NET CHANGE
Cash From Operating Activities	-19.40M	$55.02M	44.60M
Cash From Investing Activities	400.0K	$9.160M	10.70M
Cash From Financing Activities	9.000M	-$75.74M	-56.60M
Net Change In Cash	-10.00M	-$11.56M	-1.300M
YoY Change	-1192.9%	0.53%	-192.86%
FREE CASH FLOW
Cash From Operating Activities	-$19.40M	$55.02M	$44.60M
Capital Expenditures	-$1.800M	$3.689M	-$1.500M
Free Cash Flow	-$17.60M	$51.33M	$46.10M
YoY Change	-70.88%	0.06%	-54.67%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2021	dei	Amendment Flag AmendmentFlag	false
CY2021	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2021	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
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CY2021	dei	Document Type DocumentType	10-K
CY2021	dei	Document Annual Report DocumentAnnualReport	true
CY2021	dei	Document Period End Date DocumentPeriodEndDate	2021-01-02
CY2021	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--01-02
CY2021	dei	Document Transition Report DocumentTransitionReport	false
CY2021	dei	Entity File Number EntityFileNumber	001-32383
CY2021	dei	Entity Registrant Name EntityRegistrantName	BlueLinx Holdings Inc.
CY2021	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2021	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	77-0627356
CY2021	dei	Entity Address Address Line1 EntityAddressAddressLine1	1950 Spectrum Circle, Suite 300
CY2021	dei	Entity Address City Or Town EntityAddressCityOrTown	Marietta
CY2021	dei	Entity Address State Or Province EntityAddressStateOrProvince	GA
CY2021	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	30067
CY2021	dei	City Area Code CityAreaCode	770
CY2021	dei	Local Phone Number LocalPhoneNumber	953-7000
CY2021	dei	Security12b Title Security12bTitle	Common stock, par value $0.01 per share
CY2021	dei	Trading Symbol TradingSymbol	BXC
CY2021	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2021	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2021	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2021	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2021	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2021	dei	Entity Filer Category EntityFilerCategory	Accelerated Filer
CY2021	dei	Entity Small Business EntitySmallBusiness	true
CY2021	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2021	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2021	dei	Entity Shell Company EntityShellCompany	false
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CY2019	us-gaap	Net Income Loss NetIncomeLoss	-17656000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	6000	USD
CY2019	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	2560000	USD
CY2019	us-gaap	Stock Issued During Period Value Restricted Stock Award Gross StockIssuedDuringPeriodValueRestrictedStockAwardGross	2000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	2592000	USD
CY2019	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	211000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Other AdjustmentsToAdditionalPaidInCapitalOther	-4000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	-26083000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	80882000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-6000	USD
CY2021	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-1414000	USD
CY2021	us-gaap	Stock Issued During Period Value Restricted Stock Award Gross StockIssuedDuringPeriodValueRestrictedStockAwardGross	1000	USD
CY2021	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	5992000	USD
CY2021	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	271000	USD
CY2021	us-gaap	Adjustments To Additional Paid In Capital Other AdjustmentsToAdditionalPaidInCapitalOther	-9000	USD
CY2021Q1	us-gaap	Stockholders Equity StockholdersEquity	59092000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	80882000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-17656000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	14199000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-3952000	USD
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	28901000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	30232000	USD
CY2021	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	3881000	USD
CY2019	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	3323000	USD
CY2021	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	10529000	USD
CY2019	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	13082000	USD
CY2021	us-gaap	Pension Expense PensionExpense	896000	USD
CY2019	us-gaap	Pension Expense PensionExpense	3011000	USD
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	5992000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	2592000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-10304000	USD
CY2021	bxc	Amortizationof Deferred Gains AmortizationofDeferredGains	4008000	USD
CY2019	bxc	Amortizationof Deferred Gains AmortizationofDeferredGains	3960000	USD
CY2021	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	100771000	USD
CY2019	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-15562000	USD
CY2021	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-3698000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	3955000	USD
CY2021	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	32815000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-16840000	USD
CY2021	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	9546000	USD
CY2019	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-6282000	USD
CY2021	us-gaap	Increase Decrease In Pension Plan Obligations IncreaseDecreaseInPensionPlanObligations	-755000	USD
CY2019	us-gaap	Increase Decrease In Pension Plan Obligations IncreaseDecreaseInPensionPlanObligations	-1791000	USD
CY2021	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-9364000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	10070000	USD
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	55019000	USD
CY2021	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	-6009000	USD
CY2021	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	12849000	USD
CY2019	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	19931000	USD
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	3689000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	4791000	USD
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	9160000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	21149000	USD
CY2021	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	843905000	USD
CY2019	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	649788000	USD
CY2021	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	882155000	USD
CY2019	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	656596000	USD
CY2021	us-gaap	Repayments Of Senior Debt RepaymentsOfSeniorDebt	103470000	USD
CY2019	us-gaap	Repayments Of Senior Debt RepaymentsOfSeniorDebt	32426000	USD
CY2021	bxc	Proceeds From Financing Lease Obligation ProceedsFromFinancingLeaseObligation	78263000	USD
CY2019	bxc	Proceeds From Financing Lease Obligation ProceedsFromFinancingLeaseObligation	44914000	USD
CY2021	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	3350000	USD
CY2019	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	3618000	USD
CY2021	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	271000	USD
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	211000	USD
CY2021	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	8662000	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	9992000	USD
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-75740000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-8141000	USD
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-11561000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	2704000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	11643000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	8939000	USD
CY2021Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	82000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	11643000	USD
CY2021	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	14377000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	2991000	USD
CY2021	us-gaap	Interest Paid Net InterestPaidNet	43502000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	47321000	USD
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	3833000	USD
CY2019	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	15041000	USD
CY2021Q1	us-gaap	Number Of States In Which Entity Operates NumberOfStatesInWhichEntityOperates	40	state
CY2021Q1	bxc	Number Of Products NumberOfProducts	15000	product
CY2021	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="margin-bottom:12pt;margin-top:12pt;text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%">Reclassification of Prior Period Presentation</span></div><div style="margin-bottom:12pt;margin-top:12pt;text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">We have reclassified certain costs within the Consolidated Statements of Operations and Comprehensive Income (Loss) for the year ended December 28, 2019 from selling, general, and administrative to amortization of deferred gains on real estate and other operating expenses. These costs primarily relate to the amortization of gains from prior real estate sales and the integration of the acquisition of Cedar Creek, respectively.</span></div><div style="margin-bottom:12pt;margin-top:12pt;text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Additionally, an adjustment has been made to the Consolidated Statements of Cash Flows for the year ended December 28, 2019 to include outstanding payments as part of the change in accounts payable within cash flows from operating activities. In previous periods this change was included within cash flows from financing activities.</span></div>
CY2021	us-gaap	Use Of Estimates UseOfEstimates	Use of EstimatesOur financial statements are prepared in conformity with U.S. GAAP, which requires us to make estimates based on assumptions about current, and for some estimates, future economic and market conditions, which affect reported amounts and related disclosures in our financial statements. Although our current estimates contemplate current and expected future conditions, as applicable, it is reasonably possible that actual conditions could differ from our expectations, which could materially affect our results of operations and financial position. Some of our estimates may be affected by the ongoing novel coronavirus (“COVID-19”) pandemic. The severity, magnitude, and duration, as well as the economic consequences of the COVID-19 pandemic, are uncertain, rapidly changing, and difficult to predict. As a result, our accounting estimates and assumptions may change over time in response to COVID-19.
CY2021Q1	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Before Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization	299935000	USD
CY2019Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Before Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization	308067000	USD
CY2021Q1	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	121223000	USD
CY2019Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	112299000	USD
CY2021Q1	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	178712000	USD
CY2019Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	195768000	USD
CY2021Q1	bxc	Contract With Customer Standard Terms Of Payment Number Of Days ContractWithCustomerStandardTermsOfPaymentNumberOfDays	10	day
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3097328000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2637268000	USD
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3097328000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2637268000	USD
CY2021	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	40580000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	21691000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	18889000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	40580000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	14196000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	26384000	USD
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	7500000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	8100000	USD
CY2021	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.048
CY2021Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	5321000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	2763000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	1807000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	1505000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	1423000	USD
CY2021Q1	bxc	Numberof Properties Held For Sale NumberofPropertiesHeldForSale	2	property
CY2019Q4	bxc	Numberof Properties Held For Sale NumberofPropertiesHeldForSale	3	property
CY2021Q1	bxc	Number Of Former Distributor NumberOfFormerDistributor	2	distributor
CY2021	bxc	Effective Income Tax Rate Reconciliation At Federal And State Statutory Income Tax Rate Percent EffectiveIncomeTaxRateReconciliationAtFederalAndStateStatutoryIncomeTaxRatePercent	0.258
CY2021	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2019	bxc	Effective Income Tax Rate Reconciliation At Federal And State Statutory Income Tax Rate Percent EffectiveIncomeTaxRateReconciliationAtFederalAndStateStatutoryIncomeTaxRatePercent	0.273
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2019	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.063
CY2021	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.149
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.183
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	95081000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-21608000	USD
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	19673000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	35000	USD
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-9038000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-3202000	USD
CY2021	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	2946000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	-403000	USD
CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	618000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-382000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	14199000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-3952000	USD
CY2021	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.149
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.183
CY2021	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	19967000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-4538000	USD
CY2021	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	4636000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-1752000	USD
CY2021	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-4101000	USD
CY2019	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-550000	USD
CY2021	bxc	Effective Income Tax Rate Reconciliation Interest Rate Deduction Amount EffectiveIncomeTaxRateReconciliationInterestRateDeductionAmount	-4806000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	75163000	USD
CY2021Q1	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	5688000	USD
CY2019	bxc	Effective Income Tax Rate Reconciliation Interest Rate Deduction Amount EffectiveIncomeTaxRateReconciliationInterestRateDeductionAmount	4806000	USD
CY2021	us-gaap	Income Tax Reconciliation Tax Contingencies IncomeTaxReconciliationTaxContingencies	-1879000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Contingencies IncomeTaxReconciliationTaxContingencies	-1514000	USD
CY2021	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	500000	USD
CY2019	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	67000	USD
CY2021	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-118000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-471000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	14199000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-3952000	USD
CY2021Q1	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	2896000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	2525000	USD
CY2021Q1	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	6524000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	3523000	USD
CY2021Q1	bxc	Deferred Tax Assets Accounts Receivable DeferredTaxAssetsAccountsReceivable	704000	USD
CY2019Q4	bxc	Deferred Tax Assets Accounts Receivable DeferredTaxAssetsAccountsReceivable	628000	USD
CY2021Q1	bxc	Deferred Tax Assets Interest Expense Limitation DeferredTaxAssetsInterestExpenseLimitation	0	USD
CY2019Q4	bxc	Deferred Tax Assets Interest Expense Limitation DeferredTaxAssetsInterestExpenseLimitation	4767000	USD
CY2021Q1	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	50117000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	32080000	USD
CY2021Q1	bxc	Deferred Tax Assets Operating Lease Liability DeferredTaxAssetsOperatingLeaseLiability	13266000	USD
CY2019Q4	bxc	Deferred Tax Assets Operating Lease Liability DeferredTaxAssetsOperatingLeaseLiability	13820000	USD
CY2021Q1	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	7374000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	7594000	USD
CY2021Q1	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	8010000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	25731000	USD
CY2021Q1	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	585000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	689000	USD
CY2021Q1	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	89476000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	91357000	USD
CY2021Q1	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	7287000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	16194000	USD
CY2021Q1	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	82189000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	7107000	USD
CY2021Q1	bxc	Deferred Tax Liabilities Operating Lease Right Of Use Asset DeferredTaxLiabilitiesOperatingLeaseRightOfUseAsset	12848000	USD
CY2019Q4	bxc	Deferred Tax Liabilities Operating Lease Right Of Use Asset DeferredTaxLiabilitiesOperatingLeaseRightOfUseAsset	13820000	USD
CY2021Q1	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	754000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	243000	USD
CY2021Q1	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	19290000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	21170000	USD
CY2021Q1	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	62899000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	53993000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	16194000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	12348000	USD
CY2021	bxc	Valuation Allowance Operating Loss Carryforwards State And Local Jurisdiction ValuationAllowanceOperatingLossCarryforwardsStateAndLocalJurisdiction	-4101000	USD
CY2019	bxc	Valuation Allowance Operating Loss Carryforwards State And Local Jurisdiction ValuationAllowanceOperatingLossCarryforwardsStateAndLocalJurisdiction	-960000	USD
CY2021	bxc	Valuation Allowance Tax Cuts And Jobs Act Interest Limitation ValuationAllowanceTaxCutsAndJobsActInterestLimitation	-4806000	USD
CY2019	bxc	Valuation Allowance Tax Cuts And Jobs Act Interest Limitation ValuationAllowanceTaxCutsAndJobsActInterestLimitation	4806000	USD
CY2021Q1	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	7287000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	16194000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4245000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	5843000	USD
CY2021	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	1983000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	1598000	USD
CY2021Q1	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	2262000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4245000	USD
CY2021Q1	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	2100000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	4000000.0	USD
CY2021Q1	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	700000	USD
CY2019	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	4800000	USD
CY2019	bxc	Valuation Allowances Under The Tax Act And Cares ValuationAllowancesUnderTheTaxActAndCARES	4800000	USD
CY2021	bxc	Valuation Allowance Operating Loss Carryforwards State And Local Jurisdiction ValuationAllowanceOperatingLossCarryforwardsStateAndLocalJurisdiction	-4100000	USD
CY2021Q1	us-gaap	Finance Lease Liability FinanceLeaseLiability	273118000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	198011000	USD
CY2021Q1	bxc	Longterm Debt Gross And Lease Obligation LongtermDebtGrossAndLeaseObligation	604569000	USD
CY2019Q4	bxc	Longterm Debt Gross And Lease Obligation LongtermDebtGrossAndLeaseObligation	671181000	USD
CY2021Q1	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	9010000	USD
CY2019Q4	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	12555000	USD
CY2021Q1	us-gaap	Long Term Debt And Capital Lease Obligations Including Current Maturities LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities	595559000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations Including Current Maturities LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities	658626000	USD
CY2021Q1	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	6846000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	8662000	USD
CY2021Q1	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	588713000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	649964000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	107026000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	107909000	USD
CY2021	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	0	USD
CY2019	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	190000	USD
CY2021	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	2892000	USD
CY2019	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	3730000	USD
CY2021	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-9813000	USD
CY2019	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-11156000	USD
CY2021	us-gaap	Defined Benefit Plan Curtailments DefinedBenefitPlanCurtailments	0	USD
CY2019	us-gaap	Defined Benefit Plan Curtailments DefinedBenefitPlanCurtailments	349000	USD
CY2021	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	5904000	USD
CY2019	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	15610000	USD
CY2021Q1	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	113827000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	107026000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	83606000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	81241000	USD
CY2021	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	11948000	USD
CY2019	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	15464000	USD
CY2021	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	1493000	USD
CY2019	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	2511000	USD
CY2021	us-gaap	Defined Benefit Plan Plan Assets Benefits Paid DefinedBenefitPlanPlanAssetsBenefitsPaid	5904000	USD
CY2019	us-gaap	Defined Benefit Plan Plan Assets Benefits Paid DefinedBenefitPlanPlanAssetsBenefitsPaid	15610000	USD
CY2021Q1	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	91143000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	83606000	USD
CY2021Q1	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	-22684000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	-23420000	USD
CY2021Q1	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	113800000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	107000000.0	USD
CY2021Q1	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	-22700000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	-23400000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-1400000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	2600000	USD
CY2021	bxc	Increase Decreasein Funded Statusof Defined Benefit Plan IncreaseDecreaseinFundedStatusofDefinedBenefitPlan	-700000	USD
CY2021	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-9800000	USD
CY2021	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	11900000	USD
CY2021	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	1500000	USD
CY2019	bxc	Defined Benefit Plan Benefit Obligation Increase In Liability DefinedBenefitPlanBenefitObligationIncreaseInLiability	2900000	USD
CY2021	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	-900000	USD
CY2019	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	-100000	USD
CY2021Q1	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	-22684000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	-23420000	USD
CY2021Q1	bxc	Defined Benefit Plan Unrecognized Actuarial Loss DefinedBenefitPlanUnrecognizedActuarialLoss	32921000	USD
CY2019Q4	bxc	Defined Benefit Plan Unrecognized Actuarial Loss DefinedBenefitPlanUnrecognizedActuarialLoss	31221000	USD
CY2021Q1	us-gaap	Defined Benefit Plan Amounts Recognized In Balance Sheet DefinedBenefitPlanAmountsRecognizedInBalanceSheet	10237000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Amounts Recognized In Balance Sheet DefinedBenefitPlanAmountsRecognizedInBalanceSheet	7801000	USD
CY2021Q1	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	-22684000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	-23420000	USD
CY2021Q1	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax	32921000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax	31221000	USD
CY2021Q1	us-gaap	Defined Benefit Plan Amounts Recognized In Balance Sheet DefinedBenefitPlanAmountsRecognizedInBalanceSheet	10237000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Amounts Recognized In Balance Sheet DefinedBenefitPlanAmountsRecognizedInBalanceSheet	7801000	USD
CY2021	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	0	USD
CY2019	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	190000	USD
CY2021	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	2892000	USD
CY2019	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	3730000	USD
CY2021	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	4840000	USD
CY2019	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	5162000	USD
CY2021	bxc	Defined Benefit Plan Amortization Of Unrecognized Gains Losses DefinedBenefitPlanAmortizationOfUnrecognizedGainsLosses	1052000	USD
CY2019	bxc	Defined Benefit Plan Amortization Of Unrecognized Gains Losses DefinedBenefitPlanAmortizationOfUnrecognizedGainsLosses	1158000	USD
CY2021	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	-896000	USD
CY2019	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	-84000	USD
CY2021Q1	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0251
CY2019Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0321
CY2021	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0279
CY2019	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0320
CY2021	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0600
CY2019	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0600
CY2019	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0600
CY2021Q1	us-gaap	Defined Benefit Plan Plan Assets Target Allocation Percentage DefinedBenefitPlanPlanAssetsTargetAllocationPercentage	1
CY2021Q1	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1
CY2021Q1	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	6798000	USD
CY2021Q1	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Two DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	6577000	USD
CY2021Q1	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Three DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	6629000	USD
CY2021Q1	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Four DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	6635000	USD
CY2021Q1	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	6644000	USD
CY2021Q1	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	32135000	USD
CY2021Q1	us-gaap	Defined Benefit Plan Expected Future Employer Contributions Next Fiscal Year DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear	300000	USD
CY2021	us-gaap	Multiemployer Plan Employer Contribution Cost MultiemployerPlanEmployerContributionCost	300000	USD
CY2019	us-gaap	Multiemployer Plan Employer Contribution Cost MultiemployerPlanEmployerContributionCost	300000	USD
CY2021	bxc	Multiemployer Plans Employer Contribution Amount As A Percentage Of Total Contributions MultiemployerPlansEmployerContributionAmountAsAPercentageOfTotalContributions	0.0010
CY2021Q1	bxc	Multiemployer Plans Withdrawal Liability MultiemployerPlansWithdrawalLiability	8000000.0	USD
CY2019Q4	bxc	Multiemployer Plans Withdrawal Liability MultiemployerPlansWithdrawalLiability	1000000.0	USD
CY2019	bxc	Multiemployer Plans Partial Withdrawal MultiemployerPlansPartialWithdrawal	600000	USD
CY2021	bxc	Defined Contribution Plan Numberof Plans DefinedContributionPlanNumberofPlans	2	defined_contribution_plan
CY2021	bxc	Sharebased Compensation Arrangementby Sharebased Payment Award Numberof Sharebased Compensation Plans SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofSharebasedCompensationPlans	3	plan
CY2021	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P1Y10M24D
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	1000000.0	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	1900000	USD
CY2021	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	5992000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	2592000	USD
CY2021	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1500000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	700000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	80882000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-17656000	USD
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	9422000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	9355000	shares
CY2021	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	41000	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	9463000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	9355000	shares
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	8.58
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-1.89
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	8.55
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-1.89
CY2021	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	725483	shares
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	490194	shares
CY2021Q1	bxc	Lessee Leases Number Of Options To Extend LesseeLeasesNumberOfOptionsToExtend	1	option
CY2021Q1	us-gaap	Lessee Operating Lease Renewal Term LesseeOperatingLeaseRenewalTerm	P5Y
CY2018Q4	us-gaap	Lessee Finance Lease Renewal Term1 LesseeFinanceLeaseRenewalTerm1	P5Y
CY2021Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	51142000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	54408000	USD
CY2021Q1	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	148561000	USD
CY2019Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	141922000	USD
CY2021Q1	bxc	Lessee Right Of Use Asset LesseeRightOfUseAsset	199703000	USD
CY2019Q4	bxc	Lessee Right Of Use Asset LesseeRightOfUseAsset	196330000	USD
CY2021Q1	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	6076000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	7317000	USD
CY2021Q1	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	5675000	USD
CY2019Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	6486000	USD
CY2021Q1	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	44965000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	47091000	USD
CY2021Q1	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	267443000	USD
CY2019Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	191525000	USD
CY2021Q1	bxc	Lessee Lease Liabilities LesseeLeaseLiabilities	324159000	USD
CY2019Q4	bxc	Lessee Lease Liabilities LesseeLeaseLiabilities	252419000	USD
CY2021Q1	us-gaap	Finance Lease Right Of Use Asset Accumulated Amortization FinanceLeaseRightOfUseAssetAccumulatedAmortization	58600000	USD
CY2019Q4	us-gaap	Finance Lease Right Of Use Asset Accumulated Amortization FinanceLeaseRightOfUseAssetAccumulatedAmortization	30800000	USD
CY2021	us-gaap	Operating Lease Cost OperatingLeaseCost	12634000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	12115000	USD
CY2021	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	14193000	USD
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	9990000	USD
CY2021	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	23809000	USD
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	17249000	USD
CY2021	bxc	Finance Lease Cost FinanceLeaseCost	38002000	USD
CY2019	bxc	Finance Lease Cost FinanceLeaseCost	27239000	USD
CY2021	us-gaap	Operating Lease Payments OperatingLeasePayments	12256000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	11885000	USD
CY2021	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	23809000	USD
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0934
CY2021Q1	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.0987
CY2019	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	17249000	USD
CY2021	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	8662000	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	9992000	USD
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	4442000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	775000	USD
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	3833000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	15041000	USD
CY2021Q1	us-gaap	Finance Lease Right Of Use Asset Before Accumulated Amortization FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization	207147000	USD
CY2019Q4	us-gaap	Finance Lease Right Of Use Asset Before Accumulated Amortization FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization	172720000	USD
CY2021Q1	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	148561000	USD
CY2019Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	141922000	USD
CY2021Q1	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P11Y1M20D
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P11Y8M15D
CY2021Q1	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P16Y29D
CY2019Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P17Y1M13D
CY2021Q1	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0928
CY2019Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.1011
CY2021Q1	us-gaap	Finance Lease Liability FinanceLeaseLiability	273118000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	198011000	USD
CY2021Q1	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	11215000	USD
CY2021Q1	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	30159000	USD
CY2021Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	9161000	USD
CY2021Q1	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	29453000	USD
CY2021Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	8400000	USD
CY2021Q1	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	29189000	USD
CY2021Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	7283000	USD
CY2021Q1	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	28649000	USD
CY2021Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	7392000	USD
CY2021Q1	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	28102000	USD
CY2021Q1	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	44092000	USD
CY2021Q1	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	380511000	USD
CY2021Q1	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	87543000	USD
CY2021Q1	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	526063000	USD
CY2021Q1	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	36502000	USD
CY2021Q1	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	252945000	USD
CY2021Q1	us-gaap	Operating Lease Liability OperatingLeaseLiability	51041000	USD
CY2021Q1	us-gaap	Finance Lease Liability FinanceLeaseLiability	273118000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	11348000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	24002000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	10111000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	23052000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	8048000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	22230000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	7330000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	21854000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	6413000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	21380000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	50901000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	327439000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	94151000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	439957000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	39743000	USD
CY2019Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	241946000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	54408000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	198011000	USD
CY2021Q1	dei	Entity Number Of Employees EntityNumberOfEmployees	2100	employee
CY2021Q1	bxc	Entity Percentage Of Employees For Part Time EntityPercentageOfEmployeesForPartTime	0.01
CY2021Q1	bxc	Percentage Of Employees Represented By Various Labor Unions PercentageOfEmployeesRepresentedByVariousLaborUnions	0.22
CY2021	bxc	Number Of Collective Bargaining Agreements Renewals In Next Fiscal Year NumberOfCollectiveBargainingAgreementsRenewalsInNextFiscalYear	6	Agreement
CY2021Q1	bxc	Percentage Of Employees Represented Are Up For Renewal PercentageOfEmployeesRepresentedAreUpForRenewal	0.06
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-1400000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	2600000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	2566000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-1429000	USD

Files In Submission

Name	View Source	Status
0001301787-21-000013-index-headers.html	Edgar Link	pending
0001301787-21-000013-index.html	Edgar Link	pending
0001301787-21-000013.txt	Edgar Link	pending
0001301787-21-000013-xbrl.zip	Edgar Link	pending
a12202110-kxex312.htm	Edgar Link	pending
a12202110k-ex231bdoconsent.htm	Edgar Link	pending
a12202110k-ex311.htm	Edgar Link	pending
a12202110k-ex321.htm	Edgar Link	pending
a12202110k-ex322.htm	Edgar Link	pending
amendmenttoperformance-b.htm	Edgar Link	pending
amendmenttoperformance-b001.jpg	Edgar Link	pending
amendmenttoperformance-b002.jpg	Edgar Link	pending
bxc-20210102.htm	Edgar Link	pending
bxc-20210102.xsd	Edgar Link	pending
bxc-20210102_cal.xml	Edgar Link	unprocessable
bxc-20210102_def.xml	Edgar Link	unprocessable
bxc-20210102_htm.xml	Edgar Link	completed
bxc-20210102_lab.xml	Edgar Link	unprocessable
bxc-20210102_pre.xml	Edgar Link	unprocessable
descriptionofsecurities.htm	Edgar Link	pending
descriptionofsecurities001.jpg	Edgar Link	pending
descriptionofsecurities002.jpg	Edgar Link	pending
descriptionofsecurities003.jpg	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
listofsubsidiariesofthec.htm	Edgar Link	pending
listofsubsidiariesofthec001.jpg	Edgar Link	pending
listofsubsidiariesofthec002.jpg	Edgar Link	pending
listofsubsidiariesofthec003.jpg	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
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R72.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$BXC
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2021 Q1 Form 10-K Financial Statement

#000130178721000013 Filed on March 03, 2021

Income Statement

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$BXC BlueLinx Holdings Inc. Stock $bxc

2021 Q1 Form 10-K Financial Statement

#000130178721000013 Filed on March 03, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$BXC
BlueLinx Holdings Inc. Stock $bxc