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Restructuring Charges (Detail Textuals) (2007 Facility Consolidation and Severance Costs, USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 29, 2012 | Mar. 31, 2012 | Oct. 01, 2011 Building | Dec. 29, 2012 Building
2007 Facility Consolidation and Severance Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Tenant improvement allowance included in Selling, general, and administrative expenses | $ 0.9 |  |  |
Tenant improvement allowance included in Other current liabilities and Other non-current liabilities |  |  |  | 0.3
Number of unoccupied buildings |  |  | 4,100 |
Space remittance fee payable |  | $ 5.0 |  |
Number of occupied buildings |  |  |  | 4,300

X
- Definition Represents the remaining building on the Atlanta, Georgia headquarters lease. + References No definition available. + Details
Name: | bxc_OccupiedBuildingHeadquartersLease
Namespace Prefix: | bxc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the space remittance fees payable with respect to this unoccupied space. + References No definition available. + Details
Name: | bxc_SpaceRemittanceFeePayable
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the unoccupied building formerly part of the Atlanta, Georgia lease on the headquarters building. + References No definition available. + Details
Name: | bxc_UnoccupiedBuildingHeadquartersLease
Namespace Prefix: | bxc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of cash outflow for the allowance granted to lessee and/or direct costs incurred by lessor used to prepare the leased premises for tenant's occupancy. + References No definition available. + Details
Name: | us-gaap_PaymentsForTenantImprovements
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Definition Carrying amount as of the balance sheet date of improvements having a life longer than one year that were made for the benefit of one or more tenants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_TenantImprovements
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant