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Summary of Significant Accounting Policies (Detail Textuals 3) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Jul. 05, 2014 | Jan. 04, 2014
Property, Plant and Equipment [Line Items] |  |
Decrease in deferred tax asset and valuation allowance | $ (1,100) |
Total net deferred tax asset | 90,400 | 88,300
Workers' compensation liability risk | 800 |
Limited of self-insured retention for each claim involving comprehensive general liability (including product liability claims) | 800 |
Auto liability risk | 2,000 |
Limit for other insurable risks, physical loss to property (in dollars per occurrence) | 100 |
Limits for other insurable risks, medical benefit plans (in dollars per occurrence) | 300 |
Self insurance reserves | $ 7,100 | $ 6,900
Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Long - lived assets estimated useful life | 5 years |
Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Long - lived assets estimated useful life | 40 years |

X
- Definition Represents the value of increase or decrease in the deferred tax asset and it's respective valuation allowance. + References No definition available. + Details
Name: | bxc_DeferredTaxAssetAndValuationAllowanceIncreaseDecreaseAmount
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents maximum amount of loss from auto liability. + References No definition available. + Details
Name: | bxc_LossContingencyAutoLiability
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents maximum amount of loss from other insurable risks covered under medical benefit plan per occurrence. + References No definition available. + Details
Name: | bxc_LossContingencyOtherInsurableRisksMedicalBenefitPlansPerOccurrence
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents maximum amount of loss from other insurable risks, physical loss to property excluding natural catastrophes per occurrence. + References No definition available. + Details
Name: | bxc_LossContingencyOtherInsurableRisksPhysicalLossToPropertyExcludingNaturalCatastrophesPerOccurrence
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents maximum amount of loss from workers compensation. + References No definition available. + Details
Name: | bxc_LossContingencyWorkersCompensationLiability
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the value of self-insured retention for each claim involving comprehensive general liability (including product liability claims). + References No definition available. + Details
Name: | bxc_SelfInsuredRetentionClaimIncludingComprehensiveGeneralLiability
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant