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Restricted Cash Restricted Cash (Details) (USD $) In Thousands, unless otherwise specified	Jan. 03, 2015	Jan. 04, 2014
Cash in escrow:
Restricted cash	$ 18,010us-gaap_RestrictedCashAndCashEquivalents	$ 11,681us-gaap_RestrictedCashAndCashEquivalents
Mortgage
Cash in escrow:
Restricted cash	6,067us-gaap_RestrictedCashAndCashEquivalents / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_FirstMortgageMember	0us-gaap_RestrictedCashAndCashEquivalents / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_FirstMortgageMember
Insurance
Cash in escrow:
Restricted cash	7,430us-gaap_RestrictedCashAndCashEquivalents / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = bxc_InsuranceMember	7,921us-gaap_RestrictedCashAndCashEquivalents / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = bxc_InsuranceMember
Other
Cash in escrow:
Restricted cash	$ 4,513us-gaap_RestrictedCashAndCashEquivalents / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = bxc_OtherCashEscrowMember	$ 3,760us-gaap_RestrictedCashAndCashEquivalents / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = bxc_OtherCashEscrowMember

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- Definition

The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 1

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.1)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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