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Commitments and Contingencies (Detail Textuals) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 29, 2012 | Dec. 31, 2011
Commitments and Contingencies [Abstract] |  |
Workers' compensation liability risk | $ 0.8 |
Auto liability risk | 2.0 |
Limit for other insurable risks, physical loss to property, excluding natural catastrophes (in dollars per occurrence) | 0.1 |
Limits for other insurable risks, directors and officers (in dollars per occurrence) | 0.8 |
Limits for other insurable risks, medical benefit plans (in dollars per occurrence) | 0.3 |
Self insurance reserves | 7.2 | 7.6
Expense and payments related to workers compensation, auto, general liability and health and welfare reserves |  | 12.8
Expense incurred related to workers compensation, auto, general liability and health and welfare reserves | 10.7 |
Payments related to workers compensation, auto, general liability and health and welfare reserves | $ 11.1 |

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 expenses and payments net of reimbursements during the period. + References No definition available. + Details
Name: | bxc_LossContingencyExpenseAndPaymentsNetOfReimbursements
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents expenses incurred, net of reimbursements during the period. + References No definition available. + Details
Name: | bxc_LossContingencyExpenseNetOfReimbursements
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents maximum amount of loss from other insurable risks such as from directors & officers per occurrence. + References No definition available. + Details
Name: | bxc_LossContingencyOtherInsurableRisksDirectorsAndOfficersPerOccurrence
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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 the amount of cash paid for payments incurred, net of reimbursements during the period. + References No definition available. + Details
Name: | bxc_LossContingencyPaymentsNetOfReimbursements
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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
- Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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
Name: | us-gaap_SelfInsuranceReserve
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant