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Assets Held for Sale (Detail Textuals) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jul. 05, 2014	Jan. 03, 2015	Jan. 04, 2014
Office space and other location held for sale
Assets Held For Sale and Net Gain On Disposition [Line Items]
Assets held for sale	$ 1.9us-gaap_AssetsHeldForSaleAtCarryingValue / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = bxc_OfficeSpaceAndOtherLocationHeldForSaleMember
Distribution centers held for sale
Assets Held For Sale and Net Gain On Disposition [Line Items]
Assets held for sale		0.2us-gaap_AssetsHeldForSaleAtCarryingValue / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = bxc_DistributionCentersHeldForSaleMember
Selling, general and administrative expenses
Assets Held For Sale and Net Gain On Disposition [Line Items]
Recognized gain on sale of asset	5.1us-gaap_GainLossOnSaleOfPropertyPlantEquipment / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember
Other current assets
Assets Held For Sale and Net Gain On Disposition [Line Items]
Total assets held for sale		$ 0.9us-gaap_AssetsHeldForSaleCurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember	$ 2.6us-gaap_AssetsHeldForSaleCurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember

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- Definition

Represents the sum of the carrying value of all the Assets Held-for-Sale at the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760

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- Definition

Current assets (normally turning over within one year or one business cycle if longer) that are held for sale apart from normal operations and anticipated to be sold within one year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759

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- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

+ 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

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