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Mortgage (Detail Textuals) (Mortgage, USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 29, 2012 Facilities Building | Jul. 14, 2011
Mortgage |  |
Debt Instrument [Line Items] |  |
Mortgage loan | $ 295 |
Mortgage loan term | 10 years |
Distribution facilities | 51 |
Number of office building owned by special purpose | 1 |
Mortgage interest rate | 6.35% |
Payment of indebtedness under the mortgage | 11.8 | 38.3
Additional prepayment of indebtedness | 10.0 |
Aggregate cash remaining amount | 10.0 |
Debt fees | 0.3 | 2.9
Funds transferred as collateral in next twelve months | 13.2 |
Funds transferred as collateral for mortgage loans used to reduce principal amount | 6.4 |
Funds transferred as collateral for mortgage loans remitted for use | $ 6.8 |

X
- Definition This element represents the additional prepayment of the indebtedness under the mortgage agreement. + References No definition available. + Details
Name: | bxc_AdditionalPrepaymentOfIndebtedness
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition This element represents the aggregate cash remaining amount. + References No definition available. + Details
Name: | bxc_AggregateCashRemainingAmount
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents the funds transferred as collateral for mortgage loans. + References No definition available. + Details
Name: | bxc_FundsTransferredAsCollateralForMortgageLoans
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the funds transferred as collateral for mortgage loans remitted for use as indicated in the amendment. + References No definition available. + Details
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Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represents the funds transferred as collateral for mortgage loans used to reduce principal amount. + References No definition available. + Details
Name: | bxc_FundsTransferredAsCollateralForMortgageLoansUsedToReducePrincipalAmount
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Mortgage loan secured by number of distribution facilities + References No definition available. + Details
Name: | bxc_MortgageLoanSecuredByNumberOfDistributionFacilities
Namespace Prefix: | bxc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Mortgage loan secured by number of office building. + References No definition available. + Details
Name: | bxc_MortgageLoanSecuredByNumberOfOfficeBuilding
Namespace Prefix: | bxc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Mortgage loan term period. + References No definition available. + Details
Name: | bxc_MortgageLoanTerm
Namespace Prefix: | bxc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Prepayments of indebtedness under the mortgage. + References No definition available. + Details
Name: | bxc_PrepaymentsOfIndebtednessUnderMortgage
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of the fee that accompanies borrowing money under the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -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 210.5-02.22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Interest rate stated in the contractual debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration