Business and Basis of Presentation	12 Months Ended
Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business and Basis of Presentation	Business, Basis of Presentation and Going Concern Business Black Box Corporation ("Black Box," or "the Company”) is a leading digital solutions provider dedicated to helping customers design, build, manage, and secure their IT infrastructure. The Company offers Services and Products that it distributes through two platforms it has built over its 42-year history. The Services platform is comprised of engineering and design, network operations centers, technical certifications, national and international sales teams, remote monitoring, on-site service teams and technology partner centers of excellence which includes dedicated sales and engineering resources. The primary services offered through this platform include: (i) communications lifecycle services, (ii) unified communications, (iii) structured cabling, (iv) video/AV services, (v) in-building wireless and (vi) data center services. The Products platform provides networking solutions through the sale of products including: (i) IT infrastructure, (ii) specialty networking, (iii) multimedia and (iv) keyboard/video/mouse ("KVM") switching. Founded in 1976, Black Box, a Delaware corporation, is headquartered near Pittsburgh in Lawrence, Pennsylvania. Basis of Presentation References herein to "Fiscal Year," "Fiscal," or "FY" mean the Company’s fiscal year ended March 31 for the year referenced. All references to dollar amounts herein are presented in thousands, except per share amounts, unless otherwise noted. The consolidated financial statements include the accounts of the parent company and its wholly-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation. Certain items in the consolidated financial statements of prior years have been reclassified to conform to the current year’s presentation. These reclassifications had no effect on reported net income (loss), comprehensive income (loss), cash flows, total assets or total stockholders' equity. The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires Company management ("Management") to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Significant estimates in these financial statements include project progress towards completion to estimated budget, allowances for doubtful accounts receivable, sales returns, net realizable value of inventories, loss contingencies, warranty reserves, and the valuation of and useful lives associated with property, plant and equipment and intangible assets. Actual results could differ from those estimates. Management believes the estimates made are reasonable. In the second quarter of Fiscal 2018, Management completed a plan to sell the Company's current headquarters' building and adjacent vacant land and move to another local facility that better aligns to the needs of the business. At that time, Management believed it was probable that the sale of the building and land would occur in the next twelve months. As of the third quarter of Fiscal 2018, Management believed that only the sale of certain parcels of the adjacent vacant land is probable to occur in the next twelve months. As of the fourth quarter of Fiscal 2018, Management continues to believe that only the sale of certain parcels of the adjacent vacant land is probable to occur in the next twelve months. These assets, all of which are Property, plant and equipment, are presented as "Assets held for sale" on the Consolidated Balance Sheet. These assets are reported under the North America Products operating segment. Going Concern Our financial statements have been prepared assuming that we will continue as a going concern, which contemplates that we will realize our assets and satisfy our liabilities and commitments in the ordinary course of business. On June 29, 2018, the Company and all the Lenders entered into the Second Amendment to our Credit Agreement in order to waive and modify certain covenants and other provisions contained in the Amended Credit Agreement and to fund its ongoing operations with the LIFO Facility. The Company would have defaulted the minimum Adjusted EBITDA covenant and certain other covenants as defined by the Amended Credit Agreement had these defaults not been waived under the Second Amendment. See Note 6 for additional information. As of June 29, 2018, the Company had approximately $24.0 million of cash and $155.7 million of borrowings outstanding under the Second Amended Credit Agreement. We anticipate that our principal sources of liquidity, including this LIFO Facility, will be sufficient to fund our activities through approximately December 2018. Beyond that date, current conditions raise substantial doubt about our ability to repay our indebtedness under the Second Amended Credit Agreement upon maturity and to meet the covenants as defined under the Second Amendment. These conditions raise substantial doubt about the Company’s ability to continue as a going concern. These conditions are based on the Company's recurring losses from operations and negative operating cash flow, which have resulted in the need to take significant steps to generate additional liquidity. Our independent registered public accounting firm therefore has included an explanatory paragraph regarding our ability to continue as a going concern in its report on our consolidated financial statements for the year ended March 31, 2018. Our ability to continue as a going concern is dependent on raising additional capital to repay our indebtedness when due and to fund our operations and ultimately on generating future profitable operations. As part of the Company’s review of its strategic alternatives, the Company has agreed under the Second Amended Credit Agreement to pursue the sale of its Federal Business. The Company believes the expected net proceeds from the anticipated sale of the Federal Business will enable the Company to take further steps to generate additional liquidity, including entering into a transaction, selling additional assets or businesses, or obtaining alternative financing, as well as making changes to the overall cost structure of the business. We believe these plans, if successfully executed, will effectively remediate the current liquidity concerns. However, there can be no assurance that we will be able to raise sufficient additional capital through these plans, which have not yet been consummated, to repay all of our indebtedness under the Second Amended Credit Agreement.

Business, Basis of Presentation and Going Concern

Business

Black Box Corporation ("Black Box," or "the Company”) is a leading digital solutions provider dedicated to helping customers design, build, manage, and secure their IT infrastructure. The Company offers Services and Products that it distributes through two platforms it has built over its 42-year history. The Services platform is comprised of engineering and design, network operations centers, technical certifications, national and international sales teams, remote monitoring, on-site service teams and technology partner centers of excellence which includes dedicated sales and engineering resources. The primary services offered through this platform include: (i) communications lifecycle services, (ii) unified communications, (iii) structured cabling, (iv) video/AV services, (v) in-building wireless and (vi) data center services. The Products platform provides networking solutions through the sale of products including: (i) IT infrastructure, (ii) specialty networking, (iii) multimedia and (iv) keyboard/video/mouse ("KVM") switching. Founded in 1976, Black Box, a Delaware corporation, is headquartered near Pittsburgh in Lawrence, Pennsylvania.

Basis of Presentation

References herein to "Fiscal Year," "Fiscal," or "FY" mean the Company’s fiscal year ended March 31 for the year referenced. All references to dollar amounts herein are presented in thousands, except per share amounts, unless otherwise noted.

The consolidated financial statements include the accounts of the parent company and its wholly-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation. Certain items in the consolidated financial statements of prior years have been reclassified to conform to the current year’s presentation. These reclassifications had no effect on reported net income (loss), comprehensive income (loss), cash flows, total assets or total stockholders' equity.

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires Company management ("Management") to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Significant estimates in these financial statements include project progress towards completion to estimated budget, allowances for doubtful accounts receivable, sales returns, net realizable value of inventories, loss contingencies, warranty reserves, and the valuation of and useful lives associated with property, plant and equipment and intangible assets. Actual results could differ from those estimates. Management believes the estimates made are reasonable.

In the second quarter of Fiscal 2018, Management completed a plan to sell the Company's current headquarters' building and adjacent vacant land and move to another local facility that better aligns to the needs of the business. At that time, Management believed it was probable that the sale of the building and land would occur in the next twelve months. As of the third quarter of Fiscal 2018, Management believed that only the sale of certain parcels of the adjacent vacant land is probable to occur in the next twelve months. As of the fourth quarter of Fiscal 2018, Management continues to believe that only the sale of certain parcels of the adjacent vacant land is probable to occur in the next twelve months. These assets, all of which are Property, plant and equipment, are presented as "Assets held for sale" on the Consolidated Balance Sheet. These assets are reported under the North America Products operating segment.

Going Concern

Our financial statements have been prepared assuming that we will continue as a going concern, which contemplates that we will realize our assets and satisfy our liabilities and commitments in the ordinary course of business.

On June 29, 2018, the Company and all the Lenders entered into the Second Amendment to our Credit Agreement in order to waive and modify certain covenants and other provisions contained in the Amended Credit Agreement and to fund its ongoing operations with the LIFO Facility. The Company would have defaulted the minimum Adjusted EBITDA covenant and certain other covenants as defined by the Amended Credit Agreement had these defaults not been waived under the Second Amendment. See Note 6 for additional information. As of June 29, 2018, the Company had approximately $24.0 million of cash and $155.7 million of borrowings outstanding under the Second Amended Credit Agreement. We anticipate that our principal sources of liquidity, including this LIFO Facility, will be sufficient to fund our activities through approximately December 2018.

Beyond that date, current conditions raise substantial doubt about our ability to repay our indebtedness under the Second Amended Credit Agreement upon maturity and to meet the covenants as defined under the Second Amendment. These conditions raise substantial doubt about the Company’s ability to continue as a going concern. These conditions are based on the Company's recurring losses from operations and negative operating cash flow, which have resulted in the need to take significant steps to generate additional liquidity. Our independent registered public accounting firm therefore has included an explanatory paragraph regarding our ability to continue as a going concern in its report on our consolidated financial statements for the year ended March 31, 2018.

Our ability to continue as a going concern is dependent on raising additional capital to repay our indebtedness when due and to fund our operations and ultimately on generating future profitable operations. As part of the Company’s review of its strategic alternatives, the Company has agreed under the Second Amended Credit Agreement to pursue the sale of its Federal Business. The Company believes the expected net proceeds from the anticipated sale of the Federal Business will enable the Company to take further steps to generate additional liquidity, including entering into a transaction, selling additional assets or businesses, or obtaining alternative financing, as well as making changes to the overall cost structure of the business. We believe these plans, if successfully executed, will effectively remediate the current liquidity concerns. However, there can be no assurance that we will be able to raise sufficient additional capital through these plans, which have not yet been consummated, to repay all of our indebtedness under the Second Amended Credit Agreement.