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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 | $ 2,067,000 us-gaap_SeveranceCosts1 | $ 5,607,000 us-gaap_SeveranceCosts1 | $ 0 us-gaap_SeveranceCosts1 |
2013 Facility Lease Obligation and Severance Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of distribution centers to be sold or closed |  |  |  | 5 bxc_NumberOfDistributionCenterToBeClosedOrSold / us-gaap_RestructuringPlanAxis = bxc_TwoThousandThirteenFacilitySeveranceCostMember
Severance and lease facility restructuring charges | 0 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = bxc_TwoThousandThirteenFacilitySeveranceCostMember | 7,107,000 us-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 |  | 5,700,000 us-gaap_SeveranceCosts1 / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember / us-gaap_RestructuringPlanAxis = bxc_TwoThousandThirteenFacilitySeveranceCostMember |  |
Share based compensation |  | 2,900,000 bxc_ShareBasedCompensationRelatedToChangeInLeadership / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember / us-gaap_RestructuringPlanAxis = bxc_TwoThousandThirteenFacilitySeveranceCostMember |  |
Other restructuring related charges |  | 1,400,000 us-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 | 0 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = bxc_TwoThousandThirteenFacilitySeveranceCostMember | 1,398,000 us-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 |  | $ 1,400,000 us-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 |  | 2 bxc_FacilitiesClosedWithLeaseReserves / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = bxc_TwoThousandThirteenFacilitySeveranceCostMember |  |

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- Definition Represents the number of distributions centers to be closed or sold as a result of 2013 restructuring. + References No definition available. + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration related to change in leadership. + References No definition available. + Details
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- Definition Amount of other expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Definition Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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