Basis of Presentation	3 Months Ended
Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying condensed consolidated financial statements of Systemax Inc., with its subsidiaries, (the "Company") are unaudited and have been prepared in accordance with accounting principles generally accepted in the United States of America for interim financial information and the rules and regulations of the Securities and Exchange Commission. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America are not required in these interim financial statements and have been condensed or omitted. All significant intercompany accounts and transactions have been eliminated in consolidation. Systemax Inc., through its operating subsidiaries, is primarily a direct marketer of brand name and private label industrial and business equipment and supplies in North America going to market through a system of branded e-commerce websites and relationship marketers. Systemax operates and is internally managed in one reportable business segment. The Company sells a wide array of industrial and general hard goods and supplies and to a lesser extent products that would fall into the generally recognizable category of maintenance, repair and operations ("MRO"), markets the Company has served since 1949. Included in discontinued operations is the Company’s former North American Technology Group ("NATG") business, which was sold in December 2015 and has been winding down its operations since then. The sale of the NATG business had a major impact on the Company and therefore certain components met the "strategic shift with major impact" criteria as defined under Accounting Standard Update ("ASU") 2014-08, "Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity". Accordingly, these components and any related results of operations are reflected in discontinued operations. Net loss from the NATG business was $0.1 million for the three months ended March 31, 2020 and $0.3 million for the three months ended March 31, 2019. In the opinion of management, the accompanying condensed consolidated financial statements contain all normal and recurring adjustments necessary to present fairly the financial position of the Company as of March 31, 2020 and the results of operations for the three month periods ended March 31, 2020 and 2019, statements of comprehensive income (loss) for the three month periods ended March 31, 2020 and 2019, cash flows for the three month periods ended March 31, 2020 and 2019 and changes in shareholders’ equity for the three month periods ended March 31, 2020 and 2019. The December 31, 2019 Condensed Consolidated Balance Sheet has been derived from the audited consolidated financial statements included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2019. These condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements as of December 31, 2019 and for the year then ended included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2019. The results for the three month period ended March 31, 2020 are not necessarily indicative of the results for the entire year. Systemax manages its business and reports using a 52-53 week fiscal year that ends at midnight on the Saturday closest to December 31. For clarity of presentation herein, fiscal years and quarters are referred to as if they ended on the traditional calendar month. The actual fiscal first quarter ended on March 28, 2020 and March 30, 2019. The first quarters of both 2020 and 2019 included 13 weeks. Recent Accounting Pronouncements Public companies in the United States are subject to the accounting and reporting requirements of various authorities, including the Financial Accounting Standards Board (“FASB”) and the Securities and Exchange Commission (“SEC”). These authorities issue numerous pronouncements, most of which are not applicable to the Company’s current or reasonably foreseeable operating structure. In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes. This ASU clarifies and simplifies accounting for income taxes by eliminating certain exceptions for intraperiod tax allocation principles and the methodology for calculating income tax rates in an interim period, among other updates. This ASU is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020, with early adoption permitted. The Company will adopt this ASU effective January 1, 2021. The Company believes the adoption of this pronouncement will not have a material impact on the Company's financial position or results of operations.

Basis of Presentation

The accompanying condensed consolidated financial statements of Systemax Inc., with its subsidiaries, (the "Company") are unaudited and have been prepared in accordance with accounting principles generally accepted in the United States of America for interim financial information and the rules and regulations of the Securities and Exchange Commission. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America are not required in these interim financial statements and have been condensed or omitted. All significant intercompany accounts and transactions have been eliminated in consolidation.

Systemax Inc., through its operating subsidiaries, is primarily a direct marketer of brand name and private label industrial and business equipment and supplies in North America going to market through a system of branded e-commerce websites and relationship marketers. Systemax operates and is internally managed in one reportable business segment. The Company sells a wide array of industrial and general hard goods and supplies and to a lesser extent products that would fall into the generally recognizable category of maintenance, repair and operations ("MRO"), markets the Company has served since 1949.

Included in discontinued operations is the Company’s former North American Technology Group ("NATG") business, which was sold in December 2015 and has been winding down its operations since then. The sale of the NATG business had a major impact on the Company and therefore certain components met the "strategic shift with major impact" criteria as defined under Accounting Standard Update ("ASU") 2014-08, "Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity". Accordingly, these components and any related results of operations are reflected in discontinued operations. Net loss from the NATG business was $0.1 million for the three months ended March 31, 2020 and $0.3 million for the three months ended March 31, 2019.

In the opinion of management, the accompanying condensed consolidated financial statements contain all normal and recurring adjustments necessary to present fairly the financial position of the Company as of March 31, 2020 and the results of operations for the three month periods ended March 31, 2020 and 2019, statements of comprehensive income (loss) for the three month periods ended March 31, 2020 and 2019, cash flows for the three month periods ended March 31, 2020 and 2019 and changes in shareholders’ equity for the three month periods ended March 31, 2020 and 2019. The December 31, 2019 Condensed Consolidated Balance Sheet has been derived from the audited consolidated financial statements included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2019.

These condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements as of December 31, 2019 and for the year then ended included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2019. The results for the three month period ended March 31, 2020 are not necessarily indicative of the results for the entire year.

Systemax manages its business and reports using a 52-53 week fiscal year that ends at midnight on the Saturday closest to December 31. For clarity of presentation herein, fiscal years and quarters are referred to as if they ended on the traditional calendar month. The actual fiscal first quarter ended on March 28, 2020 and March 30, 2019. The first quarters of both 2020 and 2019 included 13 weeks.

Recent Accounting Pronouncements

Public companies in the United States are subject to the accounting and reporting requirements of various authorities, including the Financial Accounting Standards Board (“FASB”) and the Securities and Exchange Commission (“SEC”). These authorities issue numerous pronouncements, most of which are not applicable to the Company’s current or reasonably foreseeable operating structure.

In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes. This ASU clarifies and simplifies accounting for income taxes by eliminating certain exceptions for intraperiod tax allocation principles and the methodology for calculating income tax rates in an interim period, among other updates. This ASU is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020, with early adoption permitted. The Company will adopt this ASU effective January 1, 2021. The Company believes the adoption of this pronouncement will not have a material impact on the Company's financial position or results of operations.