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Income Taxes - Deferred Tax Asset Valuation Allowance Activity (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Jan. 02, 2016
Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Balance as of beginning of the year | $ 103,311 | $ 99,979
Valuation allowance provided for taxes related to: |  |
(Income) loss before income taxes | (5,759) | 3,332
Balance as of end of the year | $ 97,552 | $ 103,311

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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

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=65882285&loc=d3e32537-109319 + Details
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_MovementInValuationAllowancesAndReservesRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_ValuationAllowanceAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration