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Cash Held in Escrow Cash Held in Escrow (Details) - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016
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

X

- 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

X

- 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

X

- 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

X

- References

No definition available.

+ Details

Name:	us-gaap_RestrictedCashAndInvestmentsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis=us-gaap_FirstMortgageMember
Namespace Prefix:
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X

- Details

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

X

- Details

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

X

- Details

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