Basis of Presentation	9 Months Ended
Sep. 30, 2019
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. As previously disclosed in August 2018, the Company sold its France-based IT business. With the completion of the sale, Systemax operates and is internally managed in one reportable business segment, its Industrial Products Group (“IPG”), which includes its former Corporate and other segment. IPG sells a wide array of industrial and general business hard goods and supplies and to a lesser extent products that would fall into the generally recognizable category of maintenance, repair and operations ("MRO") products, markets the Company has served since 1949. The sale of the France based IT business, which had been included in the Company's former European Technology Products segment, met the “strategic shift with major impact” criteria as defined under Accounting Standards Update ("ASU") 2014-08, "Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity". Therefore, the prior year results of the France-based IT business are included in discontinued operations in the accompanying condensed consolidated financial statements. The Company recorded a pre-tax book gain on the sale of the business of approximately $178.2 million. The pre-tax book gain included proceeds from the sale of approximately $267.3 million offset by the $82.5 million of net assets sold, $1.5 million for accelerated amortization expense of restricted stock units and stock options and by $5.1 million of deal transaction costs related to the sale. For the three and nine month periods ended September 30, 2019, there were no net sales or net income (loss) of the France business included in discontinued operations. In the third quarter and for the nine months ended September 30, 2018, net sales of the France business included in discontinued operations totaled $77.1 million and $352.0 million, respectively, and in the third quarter and for the nine months ended September 30, 2018, net gain from the sale and two months of operating activity included in discontinued operations totaled $165.1 million and net gain from the sale and eight months of operating activity included in discontinued operations totaled $175.1 million, respectively. As previously disclosed, in March 2017 the Company sold Systemax Europe SARL and its subsidiaries (the “SARL Businesses”) which had been included in the Company's former European Technology Products segment. The sale of the SARL Businesses met the “strategic shift with major impact” criteria as described above. For the three and nine month periods ended September 30, 2019, there were no net sales or net income (loss) of the SARL Businesses included in discontinued operations. For the three and nine month periods ended September 30, 2018, there were no net sales of the SARL Businesses included in discontinued operations. For the three and nine month periods ended September 30, 2018, net income of the SARL Businesses included in discontinued operations totaled $0.0 million and $0.2 million, respectively. Also 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 criteria as defined under ASU 2014-08. Accordingly, these components and any related results of operations are reflected in discontinued operations. For the three and nine month periods ended September 30, 2019 and 2018, there were no net sales of the NATG business included in discontinued operations. Net loss from the NATG business was $1.0 million and $1.6 million, respectively, for the three and nine month periods ended September 30, 2019, and net loss from the NATG business was $1.4 million and $0.9 million, respectively, for the three and nine month periods ended September 30, 2018. 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 September 30, 2019 and the results of operations for the three and nine month periods ended September 30, 2019 and 2018, statements of comprehensive income for the three and nine month periods ended September 30, 2019 and 2018, cash flows for the nine month periods ended September 30, 2019 and 2018 and changes in shareholders’ equity for the three and nine month periods ended September 30, 2019 and 2018. The December 31, 2018 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, 2018. These condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements as of December 31, 2018 and for the year then ended included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2018. The results for the nine month period ended September 30, 2019 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 2019 and 2018 fiscal third quarters ended on September 28 and September 29, respectively. The third quarters of both 2019 and 2018 included 13 weeks and the first nine months of both 2019 and 2018 included 39 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 June 2018, the FASB issued ASU 2018-07, Improvements to Nonemployee Share-Based Payment Accounting, which simplifies the accounting for share-based payments to nonemployees by aligning it with the accounting for share-based payments to employees, with certain exceptions. This ASU is effective for fiscal years beginning after December 15, 2018, including interim periods within that fiscal year, with early adoption permitted after adoption of ASU 2014-09. The Company adopted this standard beginning January 1, 2019 and its adoption did not materially impact the Company's consolidated financial position or results of operations. In August 2018, the FASB issued ASU 2018-13, Fair Value Measurements, which eliminates, adds or modifies certain disclosure requirements for fair value measurements. Entities will no longer be required to disclose the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, but will be required to disclose the range and weighted average used to develop significant unobservable inputs for Level 3 fair value measurements. This ASU is effective for fiscal years beginning after December 15, 2019, including interim periods within that fiscal year, with early adoption permitted to adopt either the entire standard or only the provisions that eliminate or modify the requirements. The Company is continuing to evaluate the effect of adopting this pronouncement but does not expect a material impact on the Company's financial statements. In August 2018, the FASB issued ASU 2018-15, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract, which requires a customer in a cloud computing arrangement that is a service contract to follow the internal-use software guidance in Accounting Standards Codification 350-40 to determine which implementation costs to defer and recognize as an asset. This ASU is effective for fiscal years beginning after December 15, 2019, including interim periods within that fiscal year, with early adoption permitted, including adoption in any interim period. The Company is continuing to evaluate the effect of adopting this pronouncement but does not expect a material impact on the Company's financial statements. In June 2016, the FASB ASU 2016-13, Financial Instruments - Credit Losses: Measurement of Credit Losses on Financial Instruments as modified by subsequently issued ASU 2018-19. This ASU requires estimating credit losses for certain financial instruments, including trade receivables, held at the reporting date based on historical experience, current conditions and reasonable forecasts. This ASU is effective for fiscal years beginning after December 15, 2019, including interim periods within that fiscal year. The Company is continuing to evaluate the effect of adopting this pronouncement but does not expect a material impact on the Company's financial statements.

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.

As previously disclosed in August 2018, the Company sold its France-based IT business. With the completion of the sale, Systemax operates and is internally managed in one reportable business segment, its Industrial Products Group (“IPG”), which includes its former Corporate and other segment. IPG sells a wide array of industrial and general business hard goods and supplies and to a lesser extent products that would fall into the generally recognizable category of maintenance, repair and operations ("MRO") products, markets the Company has served since 1949.

The sale of the France based IT business, which had been included in the Company's former European Technology Products segment, met the “strategic shift with major impact” criteria as defined under Accounting Standards Update ("ASU") 2014-08, "Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity". Therefore, the prior year results of the France-based IT business are included in discontinued operations in the accompanying condensed consolidated financial statements. The Company recorded a pre-tax book gain on the sale of the business of approximately $178.2 million. The pre-tax book gain included proceeds from the sale of approximately $267.3 million offset by the $82.5 million of net assets sold, $1.5 million for accelerated amortization expense of restricted stock units and stock options and by $5.1 million of deal transaction costs related to the sale. For the three and nine month periods ended September 30, 2019, there were no net sales or net income (loss) of the France business included in discontinued operations. In the third quarter and for the nine months ended September 30, 2018, net sales of the France business included in discontinued operations totaled $77.1 million and $352.0 million, respectively, and in the third quarter and for the nine months ended September 30, 2018, net gain from the sale and two months of operating activity included in discontinued operations totaled $165.1 million and net gain from the sale and eight months of operating activity included in discontinued operations totaled $175.1 million, respectively.

As previously disclosed, in March 2017 the Company sold Systemax Europe SARL and its subsidiaries (the “SARL Businesses”) which had been included in the Company's former European Technology Products segment. The sale of the SARL Businesses met the “strategic shift with major impact” criteria as described above. For the three and nine month periods ended September 30, 2019, there were no net sales or net income (loss) of the SARL Businesses included in discontinued operations. For the three and nine month periods ended September 30, 2018, there were no net sales of the SARL Businesses included in discontinued operations. For the three and nine month periods ended September 30, 2018, net income of the SARL Businesses included in discontinued operations totaled $0.0 million and $0.2 million, respectively.

Also 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 criteria as defined under ASU 2014-08. Accordingly, these components and any related results of operations are reflected in discontinued operations. For the three and nine month periods ended September 30, 2019 and 2018, there were no net sales of the NATG business included in discontinued operations. Net loss from the NATG business was $1.0 million and $1.6 million, respectively, for the three and nine month periods ended September 30, 2019, and net loss from the NATG business was $1.4 million and $0.9 million, respectively, for the three and nine month periods ended September 30, 2018.

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 September 30, 2019 and the results of operations for the three and nine month periods ended September 30, 2019 and 2018, statements of comprehensive income for the three and nine month periods ended September 30, 2019 and 2018, cash flows for the nine month periods ended September 30, 2019 and 2018 and changes in shareholders’ equity for the three and nine month periods ended September 30, 2019 and 2018. The December 31, 2018 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, 2018.

These condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements as of December 31, 2018 and for the year then ended included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2018. The results for the nine month period ended September 30, 2019 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 2019 and 2018 fiscal third quarters ended on September 28 and September 29, respectively. The third quarters of both 2019 and 2018 included 13 weeks and the first nine months of both 2019 and 2018 included 39 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 June 2018, the FASB issued ASU 2018-07, Improvements to Nonemployee Share-Based Payment Accounting, which simplifies the accounting for share-based payments to nonemployees by aligning it with the accounting for share-based payments to employees, with certain exceptions. This ASU is effective for fiscal years beginning after December 15, 2018, including interim periods within that fiscal year, with early adoption permitted after adoption of ASU 2014-09. The Company adopted this standard beginning January 1, 2019 and its adoption did not materially impact the Company's consolidated financial position or results of operations.

In August 2018, the FASB issued ASU 2018-13, Fair Value Measurements, which eliminates, adds or modifies certain disclosure requirements for fair value measurements. Entities will no longer be required to disclose the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, but will be required to disclose the range and weighted average used to develop significant unobservable inputs for Level 3 fair value measurements. This ASU is effective for fiscal years beginning after December 15, 2019, including interim periods within that fiscal year, with early adoption permitted to adopt either the entire standard or only the provisions that eliminate or modify the requirements. The Company is continuing to evaluate the effect of adopting this pronouncement but does not expect a material impact on the Company's financial statements.

In August 2018, the FASB issued ASU 2018-15, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract, which requires a customer in a cloud computing arrangement that is a service contract to follow the internal-use software guidance in Accounting Standards Codification 350-40 to determine which implementation costs to defer and recognize as an asset. This ASU is effective for fiscal years beginning after December 15, 2019, including interim periods within that fiscal year, with early adoption permitted, including adoption in any interim period. The Company is continuing to evaluate the effect of adopting this pronouncement but does not expect a material impact on the Company's financial statements.

In June 2016, the FASB ASU 2016-13, Financial Instruments - Credit Losses: Measurement of Credit Losses on Financial Instruments as modified by subsequently issued ASU 2018-19. This ASU requires estimating credit losses for certain financial instruments, including trade receivables, held at the reporting date based on historical experience, current conditions and reasonable forecasts. This ASU is effective for fiscal years beginning after December 15, 2019, including interim periods within that fiscal year. The Company is continuing to evaluate the effect of adopting this pronouncement but does not expect a material impact on the Company's financial statements.