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Employee Benefits (Detail Textuals 1) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 3 Months Ended
--- | --- | ---
Jan. 03, 2015 | Jan. 04, 2014 | Dec. 29, 2012 | Jun. 29, 2013
Asset allocation structure of the portfolio |  |  |  |
Compound annualized risk free rate | 2.75%bxc_CompoundAnnualizedRiskFreeRate |  |  |
Expected overall portfolio return percentage | 8.29%bxc_ExpectedOverallPortfolioReturnPercentage |  |  |
Percentage of estimated expense | 0.75%bxc_ExpenseEstimatePercentage |  |  |
Net long term rate of return | 7.54%bxc_NetLongTermRateOfReturn |  |  |
Total defined benefit employer minimum required contribution |  | $ 6.0 bxc_DefinedBenefitEmployerMinimumRequiredContribution | $ 3.2 bxc_DefinedBenefitEmployerMinimumRequiredContribution |
Deferred and amortized period for defined benefit plan contribution |  |  | 5 years |
Quarterly future employer contribution in 2015 | 1.5 bxc_DefinedBenefitPlansEstimatedQuarterlyFutureEmployerContributioninNextFiscalYear |  |  |
Minimum required contribution for plan year, per quarter cash contributions during fiscal - 2015 | 6.1 us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear |  |  |
Percentages of employees represented by various labour unions | 34.00%bxc_PercentageOfEmployeesRepresentedByVariousLaborUnions |  |  |
Percentage of collective bargaining agreements up for renewal | 30.00%bxc_NumberOfCollectiveBargainingAgreementsUpForRenewal |  |  |
Contributions to the hourly defined contribution plan | 0.1 bxc_DefinedBenefitHourlyContributionPlanEmployerContributions | 0.1 bxc_DefinedBenefitHourlyContributionPlanEmployerContributions | 0.1 bxc_DefinedBenefitHourlyContributionPlanEmployerContributions |
Contributions to the salaried defined contribution plan | 0.9 bxc_DefinedBenefitSalariedContributionPlanEmployerContributions | 1.1 bxc_DefinedBenefitSalariedContributionPlanEmployerContributions | 1.0 bxc_DefinedBenefitSalariedContributionPlanEmployerContributions |
Equities |  |  |  |
Asset allocation structure of the portfolio |  |  |  |
Asset allocation structure of the portfolio | 65.00%bxc_DefinedBenefitPlanNormalAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember |  |  |
Equity securities - domestic |  |  |  |
Asset allocation structure of the portfolio |  |  |  |
Target allocations for fiscal 2015 | 55.00%bxc_DefinedBenefitPlanEstimatedTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = bxc_DomesticEquitySecuritiesMember |  |  |
Equity securities - international |  |  |  |
Asset allocation structure of the portfolio |  |  |  |
Target allocations for fiscal 2015 | 10.00%bxc_DefinedBenefitPlanEstimatedTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = bxc_InternationalEquitySecuritiesMember |  |  |
Fixed income |  |  |  |
Asset allocation structure of the portfolio |  |  |  |
Asset allocation structure of the portfolio | 30.00%bxc_DefinedBenefitPlanNormalAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_FixedIncomeFundsMember |  |  |
Target allocations for fiscal 2015 | 30.00%bxc_DefinedBenefitPlanEstimatedTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_FixedIncomeFundsMember |  |  |
Other |  |  |  |
Asset allocation structure of the portfolio |  |  |  |
Asset allocation structure of the portfolio | 5.00%bxc_DefinedBenefitPlanNormalAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = bxc_OtherInvestmentMember |  |  |
Target allocations for fiscal 2015 | 5.00%bxc_DefinedBenefitPlanEstimatedTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = bxc_OtherInvestmentMember |  |  |
Hourly Pension Plan |  |  |  |
Asset allocation structure of the portfolio |  |  |  |
Independent appraisals cost of land and buildings located in Charleston, S.C. and Buffalo, N.Y. |  | 6.8 bxc_RealPropertyValuedByIndependentAppraisals / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPensionPlansDefinedBenefitMember |  |
Lease back period for real property |  |  |  | 20 years
Lease back period extension options for real property |  |  |  | 5 years
Rent payments on monthly basis contributions in hourly pension plan | $ 0.6 bxc_RentPaymentsOnMonthlyBasisContributionsInHourlyPensionPlan / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPensionPlansDefinedBenefitMember | $ 0.5 bxc_RentPaymentsOnMonthlyBasisContributionsInHourlyPensionPlan / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPensionPlansDefinedBenefitMember |  |
Number of minimum quarterly cash contributions during fiscal 2015 and 2016 | 4 bxc_NumberOfMinimumRequiredQuarterlyCashContributionsDuringFiscal / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPensionPlansDefinedBenefitMember |  |  |

X
- Definition Represents compound annualized risk free rate. + References No definition available. + Details
Name: | bxc_CompoundAnnualizedRiskFreeRate
Namespace Prefix: | bxc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the deferred and amortized period for required defined benefit contribution. + References No definition available. + Details
Name: | bxc_DeferredAndAmortizedPeriodForDefinedBenefitPlanContribution
Namespace Prefix: | bxc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total defined benefit plan employer minimum required contribution. + References No definition available. + Details
Name: | bxc_DefinedBenefitEmployerMinimumRequiredContribution
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents amount of contributions made by the Company related to the defined hourly contribution plan. + References No definition available. + Details
Name: | bxc_DefinedBenefitHourlyContributionPlanEmployerContributions
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the estimated target allocation of investments of this type to total plan assets presented on a weighted average basis. + References No definition available. + Details
Name: | bxc_DefinedBenefitPlanEstimatedTargetPlanAssetAllocations
Namespace Prefix: | bxc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Normal allocation of investments of this type to total plan assets presented on a weighted average basis. + References No definition available. + Details
Name: | bxc_DefinedBenefitPlanNormalAssetAllocations
Namespace Prefix: | bxc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Benefit Plans, Estimated Quarterly Future Employer Contribution in Next Fiscal Year + References No definition available. + Details
Name: | bxc_DefinedBenefitPlansEstimatedQuarterlyFutureEmployerContributioninNextFiscalYear
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents amount of contributions made by the Company related to the defined salaried contribution plan. + References No definition available. + Details
Name: | bxc_DefinedBenefitSalariedContributionPlanEmployerContributions
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents expected overall portfolio return, percentage. + References No definition available. + Details
Name: | bxc_ExpectedOverallPortfolioReturnPercentage
Namespace Prefix: | bxc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents percentage of estimated expense. + References No definition available. + Details
Name: | bxc_ExpenseEstimatePercentage
Namespace Prefix: | bxc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the lease back period extension option for real property. + References No definition available. + Details
Name: | bxc_LeaseBackPeriodExtensionOptionsForRealProperty
Namespace Prefix: | bxc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the lease back period for real property. + References No definition available. + Details
Name: | bxc_LeaseBackPeriodForRealProperty
Namespace Prefix: | bxc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents net long term rate of return. + References No definition available. + Details
Name: | bxc_NetLongTermRateOfReturn
Namespace Prefix: | bxc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents number of collective bargaining agreements up for renewal. + References No definition available. + Details
Name: | bxc_NumberOfCollectiveBargainingAgreementsUpForRenewal
Namespace Prefix: | bxc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents number of minimum quarterly cash contributions during the fiscal year. + References No definition available. + Details
Name: | bxc_NumberOfMinimumRequiredQuarterlyCashContributionsDuringFiscal
Namespace Prefix: | bxc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of employees represented by various labor unions. + References No definition available. + Details
Name: | bxc_PercentageOfEmployeesRepresentedByVariousLaborUnions
Namespace Prefix: | bxc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents real property valued by independent appraisals. + References No definition available. + Details
Name: | bxc_RealPropertyValuedByIndependentAppraisals
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This element reprsents rent payments on monthly basis and contributions into hourly pension plan as of date. + References No definition available. + Details
Name: | bxc_RentPaymentsOnMonthlyBasisContributionsInHourlyPensionPlan
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition Amount of employer's best estimate 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. + 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=28361610&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=bxc_DomesticEquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=bxc_InternationalEquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=bxc_OtherInvestmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_FixedIncomeFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=us-gaap_OtherPensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |