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Fair Value Measurements (Detail Textuals) (USD $) In Millions, unless otherwise specified | Jan. 03, 2015
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Discounted carrying value |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Value of mortgage | $ 177.7 bxc_MortgageLoanFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Fair value |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Value of mortgage | $ 183.0 bxc_MortgageLoanFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember

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- Definition Represents mortgage loan fair value disclosure. + References No definition available. + Details
Name: | bxc_MortgageLoanFairValueDisclosure
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Details
Name: | us-gaap_FairValueByMeasurementBasisAxis=us-gaap_CarryingReportedAmountFairValueDisclosureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByMeasurementBasisAxis=us-gaap_EstimateOfFairValueFairValueDisclosureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |