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Cash Held in Escrow Cash Held in Escrow (Details) - USD ($) $ in Thousands | Dec. 30, 2017 | Dec. 31, 2016
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Cash in escrow |  |
Cash in escrow held by lender as a result of distribution facility sale |  | $ 1,000
Cash in escrow held by lender for capital improvements or to be applied against mortgage |  | 500
Cash in escrow | $ 11,218 | 11,638
Mortgage |  |
Cash in escrow |  |
Cash in escrow | 0 | 1,490
Insurance |  |
Cash in escrow |  |
Cash in escrow | 8,074 | 7,449
Property taxes and insurance |  |
Cash in escrow |  |
Cash in escrow | 2,904 | 2,277
Benefits-related |  |
Cash in escrow |  |
Cash in escrow | $ 240 | $ 422

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- Definition Escrow Deposit Held By Lender As a Result of Distribution Facility Sale + References No definition available. + Details
Name: | bxc_EscrowDepositHeldByLenderAsaResultofDistributionFacilitySale
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Escrow Deposit Held By Lender For Capital Improvements or to be Applied Against Mortgage + References No definition available. + Details
Name: | bxc_EscrowDepositHeldByLenderForCapitalImprovementsortobeAppliedAgainstMortgage
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_EscrowDeposit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_RestrictedCashAndInvestmentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis=us-gaap_FirstMortgageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis=bxc_InsuranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis=bxc_PropertyTaxesAndInsuranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis=bxc_BenefitsRelatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |