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Restructuring Charges (Detail Textuals) (USD $)
12 Months Ended 3 Months Ended
Jan. 03, 2015
Jan. 04, 2014
Dec. 29, 2012
Jun. 29, 2013
Distribution_Center
Restructuring Cost and Reserve [Line Items]        
Severance charges $ 2,067,000us-gaap_SeveranceCosts1 $ 5,607,000us-gaap_SeveranceCosts1 $ 0us-gaap_SeveranceCosts1  
2013 Facility Lease Obligation and Severance Costs        
Restructuring Cost and Reserve [Line Items]        
Number of distribution centers to be sold or closed       5bxc_NumberOfDistributionCenterToBeClosedOrSold
/ us-gaap_RestructuringPlanAxis
= bxc_TwoThousandThirteenFacilitySeveranceCostMember
Severance and lease facility restructuring charges 0us-gaap_RestructuringCharges
/ us-gaap_RestructuringPlanAxis
= bxc_TwoThousandThirteenFacilitySeveranceCostMember
7,107,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringPlanAxis
= bxc_TwoThousandThirteenFacilitySeveranceCostMember
   
2013 Facility Lease Obligation and Severance Costs | Selling, general and administrative expenses        
Restructuring Cost and Reserve [Line Items]        
Severance charges   5,700,000us-gaap_SeveranceCosts1
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
/ us-gaap_RestructuringPlanAxis
= bxc_TwoThousandThirteenFacilitySeveranceCostMember
   
Share based compensation   2,900,000bxc_ShareBasedCompensationRelatedToChangeInLeadership
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
/ us-gaap_RestructuringPlanAxis
= bxc_TwoThousandThirteenFacilitySeveranceCostMember
   
Other restructuring related charges   1,400,000us-gaap_OtherRestructuringCosts
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
/ us-gaap_RestructuringPlanAxis
= bxc_TwoThousandThirteenFacilitySeveranceCostMember
   
2013 Facility Lease Obligation and Severance Costs | Facility Lease Obligation        
Restructuring Cost and Reserve [Line Items]        
Severance and lease facility restructuring charges 0us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
/ us-gaap_RestructuringPlanAxis
= bxc_TwoThousandThirteenFacilitySeveranceCostMember
1,398,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
/ us-gaap_RestructuringPlanAxis
= bxc_TwoThousandThirteenFacilitySeveranceCostMember
   
2013 Facility Lease Obligation and Severance Costs | Facility Lease Obligation | Selling, general and administrative expenses        
Restructuring Cost and Reserve [Line Items]        
Severance and lease facility restructuring charges   $ 1,400,000us-gaap_RestructuringCharges
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
/ us-gaap_RestructuringPlanAxis
= bxc_TwoThousandThirteenFacilitySeveranceCostMember
   
Number of facilities closed for which lease reserves were recorded   2bxc_FacilitiesClosedWithLeaseReserves
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
/ us-gaap_RestructuringPlanAxis
= bxc_TwoThousandThirteenFacilitySeveranceCostMember