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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		$ 6.0bxc_DefinedBenefitEmployerMinimumRequiredContribution	$ 3.2bxc_DefinedBenefitEmployerMinimumRequiredContribution
Deferred and amortized period for defined benefit plan contribution			5 years
Quarterly future employer contribution in 2015	1.5bxc_DefinedBenefitPlansEstimatedQuarterlyFutureEmployerContributioninNextFiscalYear
Minimum required contribution for plan year, per quarter cash contributions during fiscal - 2015	6.1us-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	0.1bxc_DefinedBenefitHourlyContributionPlanEmployerContributions	0.1bxc_DefinedBenefitHourlyContributionPlanEmployerContributions	0.1bxc_DefinedBenefitHourlyContributionPlanEmployerContributions
Contributions to the salaried defined contribution plan	0.9bxc_DefinedBenefitSalariedContributionPlanEmployerContributions	1.1bxc_DefinedBenefitSalariedContributionPlanEmployerContributions	1.0bxc_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.		6.8bxc_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	$ 0.6bxc_RentPaymentsOnMonthlyBasisContributionsInHourlyPensionPlan / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPensionPlansDefinedBenefitMember	$ 0.5bxc_RentPaymentsOnMonthlyBasisContributionsInHourlyPensionPlan / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPensionPlansDefinedBenefitMember
Number of minimum quarterly cash contributions during fiscal 2015 and 2016	4bxc_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

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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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Details

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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:

X

- 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:

X

- Details

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