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Employee Benefits Employee Benefits (Details 6) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Jan. 03, 2015 | Jan. 04, 2014 | Dec. 29, 2012
Multiemployer Plans [Line Items] |  |  |
Multiemployer contributions for the period | $ 1.0 us-gaap_MultiemployerPlanPeriodContributions | $ 1.3 us-gaap_MultiemployerPlanPeriodContributions | $ 1.3 us-gaap_MultiemployerPlanPeriodContributions
Lumber Employees Local 786 Retirement Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
Multiemployer Plans, Certified Zone Status | Yellow |  |
Entity Tax Identification Number | 516067407 |  |
Multiemployer Plans, Funding Improvement Plan and Rehabilitation Plan | Implemented |  |
Multiemployer contributions for the period | 0.4 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = bxc_LumberEmployeesLocal786RetirementFundMember | 0.4 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = bxc_LumberEmployeesLocal786RetirementFundMember | 0.4 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = bxc_LumberEmployeesLocal786RetirementFundMember
Multiemployer Plans, Certified Zone Status, Date | Dec. 31, 2014 |  |
Other Multiemployer Plans |  |  |
Multiemployer Plans [Line Items] |  |  |
Multiemployer contributions for the period | $ 0.6 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = bxc_OtherMultiemployerPlansMember | $ 0.9 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = bxc_OtherMultiemployerPlansMember | $ 0.9 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = bxc_OtherMultiemployerPlansMember

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- Definition The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation 12B -Number 240 -Section 12b -Subsection 1 + Details
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- Definition Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450691-114947 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947 + Details
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- Definition Indicate the multiemployer plan's certified zone status as currently required by the Pension Protection Act of 2006 or a subsequent amendment thereof. The zone status categories are red (critical status), orange (seriously endangered), yellow (endangered), and green (none of the above). The acceptable values are "red", "orange", "yellow", "green", "other", and "NA". A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947 + Details
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- Definition Date of the multiemployer plan's year end to which the certified zone status relates, in CCYY-MM-DD format. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947 + Details
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- Definition Indicate whether a funding improvement plan or rehabilitation plan has been implemented or is pending for a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. The acceptable values are "no", "pending", "implemented", "other", and "NA". + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947 + Details
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- Details
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