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Revolving Credit Facilities (Detail Textuals 1) (Revolving Credit Facility, USD $) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | ---
Aug. 01, 2011 U.S. | Jul. 22, 2011 U.S. | Jul. 29, 2011 U.S. | Dec. 29, 2012 U.S. | Jan. 10, 2013 U.S. Subsequent Event | Aug. 12, 2011 Canada
Line of Credit Facility [Line Items] |  |  |  |  |  |
Revolving credit facility fixed charge coverage ratio requirement |  |  |  | 1.1 to 1.0 |  |
Lowest level of fiscal month-end availability revolving credit facility |  |  |  | $ 86.0 |  |
Minimum amount of excess availability required not to reduce outstanding borrowings by customer remittances to our lockbox |  |  |  | 35 |  |
Percentage of revolving credit facility excess availability threshold |  |  |  | 15.00% |  |
Offering of common stock to stockholders via the rights offering |  | 60 |  |  | 40 |
Approximate gross proceeds from fully subscribed rights offering of common stock |  | 60 |  |  | 40 |
Net proceeds from rights offering |  | 58 |  |  |  |
Payment on the U.S. revolving credit facility as a result of the rights offering | 6 | 56 | 50 |  | 39 |
Canadian minimum adjusted tangible net worth covenant |  |  |  |  |  | 3.9
Canadian capital expenditures maximum percentage limit covenant |  |  |  |  |  | 120.00%
Debt issuance cost |  |  |  |  |  | $ 1.0

X
- Definition Gross proceeds from rights offering. + References No definition available. + Details
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Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the maximum dollar amount of common stock offered under rights offering. + References No definition available. + Details
Name: | bxc_MaximumDollarAmountOfCommonStockOfferedUnderRightsOffering
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Canadian capital expenditure maximum percentage limit required by the lender. + References No definition available. + Details
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Namespace Prefix: | bxc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Minimum amount of excess availability required not to reduce outstanding borrowings by customer remittances to lockbox. + References No definition available. + Details
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Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum level of fiscal month end availability in the last three years. + References No definition available. + Details
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Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the lowest amount of net worth required by lender. + References No definition available. + Details
Name: | bxc_MinimumNetWorthRequiredForLenderCompliance
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Net proceeds from rights offering. + References No definition available. + Details
Name: | bxc_NetProceedsFromRightsOffering
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of revolving credit facility excess availability threshold. + References No definition available. + Details
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Namespace Prefix: | bxc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Revolving credit facility fixed charge coverage ratio requirement. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees). + References No definition available. + Details
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X
- Details
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X
- Definition The cash outflow to pay off an obligation from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -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 -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -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. + Details
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