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Revolving Credit Facilities (Detail Textuals) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 29, 2012 | Dec. 31, 2011
U.S. | Revolving credit facility |  |
Line of Credit Facility [Line Items] |  |
U.S. revolving credit facility maximum available credit less the uncommitted accordion feature | $ 400 | $ 400
Uncommitted accordion amount | 100.0 | 100.0
U.S. revolving credit facility maximum available credit | 500 |
Future maximum available credit for the future amended line of credit | 522.5 |
Additional maximum available credit for the future amended line of credit | 22.5 |
Future maximum available credit for the future amended line of credit | 422.5 |
Maturity period for future amended line of credit | 3 years |
Outstanding lines of credit | 169.5 | 93.4
Revolving credit facility excess availability | 86.0 | 115.7
Interest rate on revolving credit facility | 4.10% | 4.20%
Date of the final maturity of revolving credit facility | Jan. 07, 2014 |
U.S. | Letters of credit |  |
Line of Credit Facility [Line Items] |  |
Uncommitted accordion amount | 1.5 |
Other letters of credit | 1.5 |
Outstanding letters of credit | 4.5 | 2.7
Canada | Revolving credit facility |  |
Line of Credit Facility [Line Items] |  |
Outstanding lines of credit | 1.9 | 1.1
Revolving credit facility excess availability | $ 2.0 | $ 2.6
Interest rate on revolving credit facility | 4.00% | 4.00%
Date of the final maturity of revolving credit facility | Aug. 14, 2014 |

X
- Definition Represents the additional maximum available credit for the future amended line of credit. + References No definition available. + Details
Name: | bxc_AdditionalMaximumAvailableCreditFutureAmendedLineOfCredit
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the future maximum available credit for the future amended line of credit. + References No definition available. + Details
Name: | bxc_FutureMaximumAvailableCreditFutureAmendedLineOfCredit
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the future maximum available credit including the uncommitted accordion. + References No definition available. + Details
Name: | bxc_FutureMaximumAvailableCreditIncludingUncommittedAccordion
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This element represents the amount of uncommitted accordion of the line of credit. + References No definition available. + Details
Name: | bxc_LineOfCreditFacilityUncommittedAccordionAmount
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the maturity period for future amended line of credit. + References No definition available. + Details
Name: | bxc_MaturityPeriodForFutureAmendedLineOfCredit
Namespace Prefix: | bxc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Outstanding letters of credit securing certain obligations, as of the balance sheet date. + References No definition available. + Details
Name: | bxc_OutstandingLettersOfCreditCertainObligations
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Outstanding letters of credit securing certain other insurance obligations, as of the balance sheet date. + References No definition available. + Details
Name: | bxc_OutstandingLettersOfCreditOther
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Revolving credit facility excess availability threshold amount + References No definition available. + Details
Name: | bxc_RevolvingCreditFacilityExcessAvailabilityThresholdAmount
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityAmountOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition The effective interest rate at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant