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Cash Held in Escrow Cash Held in Escrow (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Jan. 02, 2016
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Cash in escrow |  |
Cash in escrow | $ 11,638 | $ 21,188
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 |
Mortgage |  |
Cash in escrow |  |
Cash in escrow | 1,490 | 9,118
Insurance |  |
Cash in escrow |  |
Cash in escrow | 7,449 | 7,437
Other |  |
Cash in escrow |  |
Cash in escrow | $ 2,699 | $ 4,633

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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_OtherCashEscrowMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |