Summary of Significant Accounting Policies (Policies)	9 Months Ended
Sep. 30, 2017
Accounting Policies [Abstract]
Basis of Presentation	Basis of PresentationThe accompanying unaudited Condensed Consolidated Financial Statements include the accounts of BlueLinx Holdings Inc. and its wholly owned subsidiaries (the “Company”). These financial statements have been prepared in accordance with the instructions to Form 10-Q and do not include all of the information and footnotes required by accounting principles generally accepted (“GAAP”) in the United States (“U.S.”) for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. These statements should be read in conjunction with the Consolidated Financial Statements and notes thereto included in the Company’s Annual Report on Form 10-K (the “Annual Report on Form 10-K”) for the year ended December 31, 2016, as filed with the Securities and Exchange Commission on March 2, 2017.
New Accounting Standards	New Accounting StandardsRevenue from Contracts with Customers. In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (“ASU”) 2014-09, “Revenue from Contracts with Customers (Topic 606),” which supersedes the revenue recognition requirements in Accounting Standards Codification (“ASC”) 605, Revenue Recognition. The new revenue recognition standard requires entities to recognize revenue in a way that depicts the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. ASU 2014-09 will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective. The new standard is effective on January 1, 2018. We have elected to adopt the revenue recognition standard in the first quarter of 2018 with a cumulative adjustment to retained earnings. We have substantially completed our assessment of the new revenue recognition guidance. Based upon current interpretations, we do not anticipate the adoption of this standard to have a material impact on our financial statements; aside from adding expanded disclosures, which are currently under consideration, as are further considerations of potential additional or expanded internal controls over financial reporting.
Earnings per Share	We calculate basic earnings per share by dividing net income by the weighted average number of common shares outstanding, excluding unvested restricted shares. We calculate diluted earnings per share by dividing net income by the weighted average number of common shares outstanding plus the dilutive effect of outstanding share-based awards, including restricted stock awards, restricted stock units, performance shares, and stock options. Antidilutive or out-of-the-money common stock equivalents excluded from the diluted earnings per share calculation for the quarter and year-to-date during fiscal 2017 include all outstanding options and performance shares; and, additionally, for year-to-date only, an immaterial number of restricted stock units.

Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2017

Basis of PresentationThe accompanying unaudited Condensed Consolidated Financial Statements include the accounts of BlueLinx Holdings Inc. and its wholly owned subsidiaries (the “Company”). These financial statements have been prepared in accordance with the instructions to Form 10-Q and do not include all of the information and footnotes required by accounting principles generally accepted (“GAAP”) in the United States (“U.S.”) for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. These statements should be read in conjunction with the Consolidated Financial Statements and notes thereto included in the Company’s Annual Report on Form 10-K (the “Annual Report on Form 10-K”) for the year ended December 31, 2016, as filed with the Securities and Exchange Commission on March 2, 2017.

New Accounting Standards

New Accounting StandardsRevenue from Contracts with Customers. In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (“ASU”) 2014-09, “Revenue from Contracts with Customers (Topic 606),” which supersedes the revenue recognition requirements in Accounting Standards Codification (“ASC”) 605, Revenue Recognition. The new revenue recognition standard requires entities to recognize revenue in a way that depicts the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. ASU 2014-09 will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective. The new standard is effective on January 1, 2018. We have elected to adopt the revenue recognition standard in the first quarter of 2018 with a cumulative adjustment to retained earnings. We have substantially completed our assessment of the new revenue recognition guidance. Based upon current interpretations, we do not anticipate the adoption of this standard to have a material impact on our financial statements; aside from adding expanded disclosures, which are currently under consideration, as are further considerations of potential additional or expanded internal controls over financial reporting.

Earnings per Share

We calculate basic earnings per share by dividing net income by the weighted average number of common shares outstanding, excluding unvested restricted shares. We calculate diluted earnings per share by dividing net income by the weighted average number of common shares outstanding plus the dilutive effect of outstanding share-based awards, including restricted stock awards, restricted stock units, performance shares, and stock options. Antidilutive or out-of-the-money common stock equivalents excluded from the diluted earnings per share calculation for the quarter and year-to-date during fiscal 2017 include all outstanding options and performance shares; and, additionally, for year-to-date only, an immaterial number of restricted stock units.