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Cash Held in Escrow Cash Held in Escrow (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Jan. 02, 2016
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

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:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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