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Share-Based Compensation (Details Textuals) (USD $)
12 Months Ended
Jan. 03, 2015
Employee
Jan. 04, 2014
Dec. 29, 2012
Jan. 02, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total fair value of vested stocks $ 2,400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue $ 6,400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue $ 2,300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue  
Employees no longer employed by the Company 4bxc_SharebasedCompensationArrangementsbySharebasedPaymentAwardOptionsFormerEmployeesWithOptions      
Director who did not stand for re-election 1bxc_SharebasedCompensationArrangementsbySharebasedPaymentAwardOptionsFormerDirectorWithOptions      
Stock-based compensation expense 3,840,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax 6,117,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax 2,797,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax  
Benefits of tax deductions in excess of recognized compensation expense (16,000)us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 16,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 0us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities  
Stock-Based Compensation Expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average remaining contractual term   1 year 8 months 12 days    
Share based compensation related to 2013 restructuring and change in executive leadership   2,900,000bxc_ShareBasedCompensationRelatedToChangeInLeadership
/ us-gaap_AwardTypeAxis
= us-gaap_StockCompensationPlanMember
   
Income tax benefits offset by a valuation allowance 1,500,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_StockCompensationPlanMember
2,400,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_StockCompensationPlanMember
1,100,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_StockCompensationPlanMember
 
Stock-Based Compensation Expense | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average remaining contractual term 10 years      
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total unrecognized compensation expense 1,900,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Weighted average term for compensation expense to be recognized 1 year 10 months 24 days      
Stock-based compensation expense 1,941,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
3,521,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
2,730,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Restricted Stock | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards vesting period 1 year      
Restricted Stock | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards vesting period 3 years      
Weighted average remaining contractual term 3 years      
Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total unrecognized compensation expense 500,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
     
Weighted average term for compensation expense to be recognized 10 months 24 days      
Weighted average remaining contractual term 8 months 12 days      
Total fair value of vested stocks 1,700,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
1,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
   
Stock-based compensation expense 1,725,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
2,596,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
0us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
Performance Shares | Former Directors and Employees [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value of awards based on opening price of common stock (in dollars per share)       $ 1.14us-gaap_SharePrice
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= bxc_FormerDirectorsandEmployeesMember
Shares vested during the period 161,024us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= bxc_FormerDirectorsandEmployeesMember
     
Nonvested number of shares outstanding 828,568us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= bxc_FormerDirectorsandEmployeesMember
     
Stock-based compensation expense 1,200,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= bxc_FormerDirectorsandEmployeesMember
     
Performance Shares | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average remaining contractual term 3 years      
Restricted Stock Units (RSUs) | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average remaining contractual term 3 years      
Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options granted in the period 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Stock options exercised in the period 0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Stock-based compensation expense 174,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
0us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
67,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Deferred Compensation Arrangement with Individual, Compensation Expense $ 0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
Long term equity incentive plan 2004 | Stock-Based Compensation Expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares reserved for issuance 2,222,222us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_StockCompensationPlanMember
/ us-gaap_PlanNameAxis
= bxc_EquityIncentivePlan2004Member
     
Long term equity incentive plan 2006 | Stock-Based Compensation Expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares reserved for issuance 12,200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_StockCompensationPlanMember
/ us-gaap_PlanNameAxis
= bxc_LongTermEquityIncentivePlan2006Member