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Employee Benefits (Detail Textuals 2) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 04, 2014 | Dec. 29, 2012 | Jun. 29, 2013 Hourly Pension Plan | Jan. 04, 2014 Hourly Pension Plan Payment
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total defined benefit employer minimum required contribution | $ 6.0 | $ 3.2 |  |
Minimum required contribution for plan year, per quarter cash contributions during fiscal - 2014 | 1.5 |  |  |
Deferred and amortized period for defined benefit plan contribution |  | 5 years |  |
Number of minimum quarterly cash contributions during fiscal 2013 |  |  |  | 3
Independent appraisals cost of land and buildings located in Charleston, S.C. and Buffalo, N.Y. |  |  | 6.8 |
Lease back period for real property |  |  | 20 years |
Lease back period extension options for real property |  |  | 5 years |
Additional pension contribution, if waiver is not granted | 2.2 |  |  |
Rent payments on monthly basis contributions in hourly pension plan |  |  |  | $ 0.5

X
- Definition Represents amount of additional pension contribution. + References No definition available. + Details
Name: | bxc_AdditionalPensionContribution
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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 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 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 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

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- 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