Summary of Significant Accounting Policies (Policies)	12 Months Ended
Summary of Significant Accounting Policies (Policies)	Jan. 02, 2016
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation BlueLinx is a wholesale supplier of building products in North America. Our Consolidated Financial Statements include the accounts of BlueLinx Holdings Inc. and its wholly owned subsidiaries. These financial statements have been prepared in accordance with U.S. GAAP. All significant intercompany accounts and transactions have been eliminated. Fiscal 2015 and fiscal 2014 both comprised 52 weeks, and fiscal 2013 comprised 53 weeks.
Use of Estimates	Use of Estimates We are required to make estimates and assumptions when preparing our Consolidated Financial Statements in accordance with U.S. GAAP. These estimates and assumptions affect the amounts reported in our Consolidated Financial Statements and the accompanying notes. Actual results could differ materially from those estimates.
Recent Accounting Standards	Recent Accounting Standards Revenue from Contracts with Customers. In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09, “Revenue from Contracts with Customers.” Under the new standard, revenue is recognized at the time a good or service is transferred to a customer for the amount of consideration received for that specific good or service. Entities may use a full retrospective approach or report the cumulative effect as of the date of adoption. In August 2015, the FASB issued ASU No. 2015-14, “Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date,” which deferred the effective date by one year to December 15, 2017, for interim and annual reporting periods beginning after that date. The FASB permitted early adoption of the standard, but not before the original effective date of December 15, 2016. We are currently evaluating how the adoption of this standard will impact our consolidated financial statements. Going Concern. In September 2014, the FASB issued ASU 2014-15, “Presentation of Financial Statements - Going Concern.” The ASU requires management to evaluate relevant conditions, events, and certain management plans that are known or reasonably knowable as of the evaluation date when determining whether substantial doubt about an entity’s ability to continue as a going concern exists within one year from the date that the financial statements are issued. ASU 2014-15 is effective for annual periods ending after December 15, 2016, and for annual and interim periods thereafter. Early adoption is permitted. We are currently evaluating the impact the adoption of this ASU will have on our consolidated financial statements. Leases. In February 2016, the FASB issued ASU 2016-02, “Leases.” The new standard establishes a right-of-use model that requires a lessee to record a right-of-use asset and a lease liability on the balance sheet for all leases with terms longer than twelve months. Leases will be classified as either “finance” or “operating,” with classification affecting the pattern of expense recognition in the income statement. The new standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. A modified retrospective transition approach is required for lessees for capital and operating leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with certain practical expedients available. Early adoption is permitted. We are currently evaluating the impact the adoption of this ASU will have on our consolidated financial statements. Inventories. In July 2015, the FASB issued ASU 2015-11, “Inventory.” The ASU requires entities that measure inventory using methods including the average cost method to measure inventory at the lower of cost and net realizable value. ASU 2015-11 is effective for fiscal years beginning after December 15, 2016, and for interim periods within those fiscal years. Early adoption is permitted. We do not expect that the adoption of these provisions will have a material effect on our consolidated financial statements. Presentation of Debt Issuance Costs. We have adopted ASU 2015-03, “Interest - Imputation of Interest.” See Note 16. Balance Sheet Classification of Deferred Taxes. In November 2015, the FASB issued ASU No. 2015-17, “Balance Sheet Classification of Deferred Taxes.” This standard requires that deferred tax liabilities and assets be classified as noncurrent on the balance sheet. It is effective for interim and annual periods beginning after December 15, 2016, but early adoption is permitted. We adopted ASU 2015-17 effective January 2, 2016, on a prospective basis. Adoption of this ASU resulted in a reclassification of our net current deferred tax liability to the net non-current deferred tax liability in our Consolidated Balance Sheet as of January 2, 2016. No prior periods were retrospectively adjusted. The adoption of this guidance had no impact on our consolidated results of operations.
Reclassifications	Reclassifications Certain other amounts in the prior years’ consolidated financial statements and notes have been revised to conform to the current year presentation. During fiscal 2015, we separately stated quarterly pension contributions, which historically had been presented as “Other” changes in the “Cash flows from operating activities.” To conform the historical presentation to the current and future presentation, we separately have detailed quarterly pension contributions in prior periods from “Other” changes in the “Cash flows from operating activities.” Additionally, some prior year items that were immaterial have been reclassified to “Other” changes in both “Cash flows from operating activities” and “Cash flows from financing activities.”
Revenue Recognition	Revenue Recognition We recognize revenue when the following criteria are met: persuasive evidence of an agreement exists, delivery has occurred or services have been rendered, our price to the buyer is fixed and determinable, and collectability is reasonably assured. Delivery is not considered to have occurred until the customer takes title and assumes the risks and rewards of ownership. The timing of revenue recognition largely is dependent on shipping terms. Revenue is recorded at the time of shipment for terms designated free on board (“FOB”) shipping point. For sales transactions designated FOB destination, revenue is recorded when the product is delivered to the customer’s delivery site. In addition, we provide inventory to certain customers through pre-arranged agreements on a consignment basis. Customer consigned inventory is maintained and stored by certain customers; however, ownership and risk of loss remains with us. When the consigned inventory is sold by the customer, we recognize revenue on a gross basis. Customer consigned inventory was approximately $4.9 million and $6.3 million as of January 2, 2016, and January 3, 2015, respectively. All revenues recognized are net of trade allowances, cash discounts, and sales returns. Cash discounts and sales returns are estimated using historical experience. Trade allowances are based on the estimated obligations and historical experience. Adjustments to earnings resulting from revisions to estimates on discounts and returns have been insignificant for each of the reported periods.
Accounts Receivable	Accounts Receivable Accounts receivable are stated at net realizable value, do not bear interest, and consist of amounts owed for orders shipped to customers. Management establishes an overall credit policy for sales to customers. The allowance for doubtful accounts is determined based on a number of factors including specific customer account reviews, historical loss experience, current economic trends, and the creditworthiness of significant customers based on ongoing credit evaluations.
Inventory Valuation	Inventory Valuation The cost of all inventories is determined by the moving average cost method. We have included all material charges directly or indirectly incurred in bringing inventory to its existing condition and location. We evaluate our inventory value at the end of each quarter to ensure that inventory, when viewed by category, is carried at the lower of cost or market. Additionally, we estimate and maintain a reserve for damaged, excess and obsolete inventory.
Consideration Received from Vendors and Paid to Customers	Consideration Received from Vendors and Paid to Customers Each year, we enter into agreements with many of our vendors providing for inventory purchase rebates, generally based on achievement of specified volume purchasing levels. We also receive rebates related to price protection and various marketing allowances that are common industry practice. We accrue for the receipt of vendor rebates based on purchases, and also reduce inventory to reflect the net acquisition cost (purchase price less expected purchase rebates). As of January 2, 2016, and January 3, 2015, the vendor rebate receivable totaled $8.0 million and $7.1 million, respectively. Adjustments to earnings resulting from revisions to rebate estimates have been immaterial. In addition, we enter into agreements with many of our customers to offer customer rebates, generally based on achievement of specified sales levels and various marketing allowances that are common industry practice. We accrue for the payment of customer rebates based on sales to the customer, and also reduce sales to reflect the net sales (sales price less expected customer rebates).
Shipping and Handling	Shipping and Handling Amounts billed to customers in sales transactions related to shipping and handling are classified as revenue.
Advertising Costs	Advertising Costs Advertising costs are expensed as incurred.
Property and Equipment	Property and Equipment Property and equipment are recorded at cost. Lease obligations for which we assume or retain substantially all the property rights and risks of ownership are capitalized. Amortization of assets recorded under capital leases is included in “Depreciation and amortization” expense. Replacements of major units of property are capitalized and the replaced properties are retired. Replacements of minor components of property and repair and maintenance costs are charged to expense as incurred. Depreciation is computed using the straight-line method over the estimated useful lives of the related assets. Upon retirement or disposition of assets, cost and accumulated depreciation are removed from the related accounts and any gain or loss is included in income.
Share-Based Compensation	Share-Based Compensation We recognize compensation expense equal to the grant-date fair value for all share-based payment awards that are expected to vest. This expense is recorded on a straight-line basis over the requisite service period of the entire award, unless the awards are subject to market or performance conditions, in which case we recognize compensation expense over the requisite service period of each separate vesting tranche to the extent market and performance conditions are considered probable. The calculation of fair value related to share-based compensation is subject to certain assumptions discussed in more detail in Note 10. Management updates such estimates when circumstances warrant. All compensation expense related to our share-based payment awards is recorded in “Selling, general and administrative” expense in the Consolidated Statements of Operations and Comprehensive Loss.
Income Taxes	Income Taxes We account for deferred income taxes using the liability method. Accordingly, we recognize deferred tax assets and liabilities based on the tax effects of temporary differences between the financial statement and tax bases of assets and liabilities, as measured by current enacted tax rates. Deferred tax assets and liabilities are recorded net, as current and noncurrent, when applicable. A valuation allowance is recorded to reduce deferred tax assets when necessary.
Self-insurance	Self-Insurance For all fiscal years presented, the Company was self-insured, up to certain limits, for most workers’ compensation losses, employee health benefits, general liability, and automotive liability losses, all subject to varying “per occurrence” retentions or deductible limits. The Company provides for estimated costs to settle both known claims and claims incurred but not yet reported. Liabilities associated with these claims are estimated, in part, by considering the frequency and severity of historical claims, both specific to us, as well as industry-wide loss experience and other actuarial assumptions. We determine our insurance obligations with the assistance of actuarial firms. Since there are many estimates and assumptions involved in recording insurance liabilities and in the case of workers’ compensation a significant period of time elapses before the ultimate resolution of claims, differences between actual future events and prior estimates and assumptions could result in adjustments to these liabilities.