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Employee Benefits (Detail Textuals 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 29, 2012 Payment
Employee Benefits [Abstract]
Cash contribution to the pension plan	$ 3.3
Minimum required contribution for plan year - 2011	1.2
Minimum required contribution for plan year - 2012	2.1
Minimum required contribution for plan year, per quarter cash contributions during fiscal - 2013	0.8
Company's minimum required contribution for plan year 2012	3.2
Minimum required contribution, cash funded by company	1.2
Contributions defaulted related to the 2012 minimum required contribution	$ 2.1
Deferred and amortized period for defined benefit plan contribution	5 years
Number of minimum quarterly cash contributions during fiscal 2013	3

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- Definition

Represents the deferred and amortized period for required defined benefit contribution.

+ References

No definition available.

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- Definition

Represents defined benefit plan minimum contributions by employer

+ References

No definition available.

+ Details

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Namespace Prefix:	bxc_
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- Definition

Represents defined benefit plan minimum contributions by employer defaulted.

+ References

No definition available.

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- Definition

Represents minimum required contribution cash funded by employer.

+ References

No definition available.

+ Details

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- Definition

Represents minimum required contribution cash funded by employer.

+ References

No definition available.

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- Definition

Represents minimum required contribution cash funded by employer.

+ References

No definition available.

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- Definition

Represents the number of minimum quarterly cash contributions during the fiscal year.

+ References

No definition available.

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Namespace Prefix:	bxc_
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- Definition

The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph g

-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.

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- Definition

The amount of cash or cash equivalents contributed by the entity to fund its pension plans.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-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 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3536-108585

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