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Document and Entity Information - shares	3 Months Ended
	Mar. 30, 2019	May 03, 2019
Document and Entity Information [Abstract]
Entity Registrant Name	BlueLinx Holdings Inc.
Entity Central Index Key	0001301787
Trading Symbol	bxc
Current Fiscal Year Date	--12-28
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		9,346,727
Document Type	10-Q
Document Period End Date	Mar. 30, 2019
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Indicate number of shares or other units outstanding of each of registrant's classes of capital or common stock or other ownership interests, if and as stated on cover of related periodic report. Where multiple classes or units exist define each class/interest by adding class of stock items such as Common Class A [Member], Common Class B [Member] or Partnership Interest [Member] onto the Instrument [Domain] of the Entity Listings, Instrument.

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