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

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- 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

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- 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

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