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Income Taxes (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 03, 2015	Jan. 04, 2014
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of the year	$ 88,279us-gaap_DeferredTaxAssetsValuationAllowance	$ 78,050us-gaap_DeferredTaxAssetsValuationAllowance
Loss before income taxes	11,700bxc_ValuationAllowancesProvidedForTaxesRelatedToIncomeBeforeIncomeTaxes	10,229bxc_ValuationAllowancesProvidedForTaxesRelatedToIncomeBeforeIncomeTaxes
Balance at end of the year	$ 99,979us-gaap_DeferredTaxAssetsValuationAllowance	$ 88,279us-gaap_DeferredTaxAssetsValuationAllowance

X

- Definition

This element represent represents valuation allowance provided for taxes related to loss before income tax.

+ References

No definition available.

+ Details

Name:	bxc_ValuationAllowancesProvidedForTaxesRelatedToIncomeBeforeIncomeTaxes
Namespace Prefix:	bxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

+ Details

Name:	us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_MovementInValuationAllowancesAndReservesRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration