Description of Business	12 Months Ended
Jun. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	Description of Business Mercury Systems, Inc. (the “Company” or “Mercury”) is a leading commercial provider of secure processing subsystems designed and made in the U.S.A. Optimized for customer and mission success, its solutions power a wide variety of critical defense and intelligence programs. Headquartered in Chelmsford, Massachusetts, it is pioneering a next-generation defense electronics business model specifically designed to meet the industry's current and emerging technology and business needs. The Company delivers affordable innovative solutions, rapid time-to-value and service and support to its defense prime contractor customers. The Company's products and solutions have been deployed in more than 300 programs with over 25 different defense prime contractors. Key programs include Aegis, Patriot, Surface Electronic Warfare Improvement Program ("SEWIP"), Gorgon Stare, Predator, F-35 and Reaper. The Company's organizational structure allows it to deliver capabilities that combine technology building blocks and deep domain expertise in the defense sector. On May 2, 2016, the Company acquired the custom microelectronics, RF and microwave solutions, and embedded security operations from Microsemi Corporation (the “Carve-Out Business”), resulting in the entities comprising the Carve-Out Business becoming 100% owned direct or indirect subsidiaries of Mercury (the “Acquisition”). Under the terms of the Stock Purchase Agreement, the Company paid $300,000 in cash on a cash-free, debt-free basis, subject to working capital and other post-closing adjustments. On December 16, 2015, the Company acquired Lewis Innovative Technologies, Inc. (“LIT”) for $10,000 in cash on a cash-free, debt-free basis, subject to working capital and other post-closing adjustments. See Note C to consolidated financial statements. During fiscal 2016, the Company completed a series of important internal organizational changes in order to integrate, align and scale the Company into one business. In addition, over the past several years, the Company has completed several acquisitions, culminating with the Acquisition on May 2, 2016 to support its strategy of creating a better alternative for affordable, secure processing subsystems designed and made in the U.S.A. These strategic acquisitions and the associated operational and managerial changes finalized the transformation of the way the Company's executive management team, including the CEO as the chief operating decision maker (“CODM”), manage, evaluate and review the business, including how the CODM allocates resources and assesses performance. Therefore, during the fourth quarter ended June 30, 2016, the Company eliminated the use of Mercury Commercial Electronics (“MCE”) and Mercury Defense Systems (“MDS”) as reportable segments because the analogous operating segments ceased to exist. The Company is now comprised of one operating and reportable segment. The Company utilized the management approach for determining its operating segment in accordance with Financial Accounting Standard Boards (“FASB”) Accounting Standards Codification (“ASC”) 280, Segment Reporting (“FASB ASC 280”). In June 2014, the Company initiated a plan to divest its Mercury Intelligence Systems (“MIS”) business, based on the Company's strategic direction and investment priorities focusing on its core business. As a result, the Company's MIS business met the “held for sale” criteria in accordance with FASB ASC 205, Presentation of Financial Statements, as of June 30, 2014 (see Note Q to consolidated financial statements). On January 23, 2015, the Company completed the sale of its MIS business. The consolidated financial statements, excluding the statements of shareholders' equity and cash flows, and the notes to the consolidated financial statements were restated for all periods presented to reflect the discontinuation of the MIS business, in accordance with FASB ASC 205.

Description of Business

Mercury Systems, Inc. (the “Company” or “Mercury”) is a leading commercial provider of secure processing subsystems designed and made in the U.S.A. Optimized for customer and mission success, its solutions power a wide variety of critical defense and intelligence programs. Headquartered in Chelmsford, Massachusetts, it is pioneering a next-generation defense electronics business model specifically designed to meet the industry's current and emerging technology and business needs. The Company delivers affordable innovative solutions, rapid time-to-value and service and support to its defense prime contractor customers. The Company's products and solutions have been deployed in more than 300 programs with over 25 different defense prime contractors. Key programs include Aegis, Patriot, Surface Electronic Warfare Improvement Program ("SEWIP"), Gorgon Stare, Predator, F-35 and Reaper. The Company's organizational structure allows it to deliver capabilities that combine technology building blocks and deep domain expertise in the defense sector.

On May 2, 2016, the Company acquired the custom microelectronics, RF and microwave solutions, and embedded security operations from Microsemi Corporation (the “Carve-Out Business”), resulting in the entities comprising the Carve-Out Business becoming 100% owned direct or indirect subsidiaries of Mercury (the “Acquisition”). Under the terms of the Stock Purchase Agreement, the Company paid $300,000 in cash on a cash-free, debt-free basis, subject to working capital and other post-closing adjustments. On December 16, 2015, the Company acquired Lewis Innovative Technologies, Inc. (“LIT”) for $10,000 in cash on a cash-free, debt-free basis, subject to working capital and other post-closing adjustments. See Note C to consolidated financial statements.

During fiscal 2016, the Company completed a series of important internal organizational changes in order to integrate, align and scale the Company into one business. In addition, over the past several years, the Company has completed several acquisitions, culminating with the Acquisition on May 2, 2016 to support its strategy of creating a better alternative for affordable, secure processing subsystems designed and made in the U.S.A. These strategic acquisitions and the associated operational and managerial changes finalized the transformation of the way the Company's executive management team, including the CEO as the chief operating decision maker (“CODM”), manage, evaluate and review the business, including how the CODM allocates resources and assesses performance. Therefore, during the fourth quarter ended June 30, 2016, the Company eliminated the use of Mercury Commercial Electronics (“MCE”) and Mercury Defense Systems (“MDS”) as reportable segments because the analogous operating segments ceased to exist. The Company is now comprised of one operating and reportable segment. The Company utilized the management approach for determining its operating segment in accordance with Financial Accounting Standard Boards (“FASB”) Accounting Standards Codification (“ASC”) 280, Segment Reporting (“FASB ASC 280”).

In June 2014, the Company initiated a plan to divest its Mercury Intelligence Systems (“MIS”) business, based on the Company's strategic direction and investment priorities focusing on its core business. As a result, the Company's MIS business met the “held for sale” criteria in accordance with FASB ASC 205, Presentation of Financial Statements, as of June 30, 2014 (see Note Q to consolidated financial statements). On January 23, 2015, the Company completed the sale of its MIS business. The consolidated financial statements, excluding the statements of shareholders' equity and cash flows, and the notes to the consolidated financial statements were restated for all periods presented to reflect the discontinuation of the MIS business, in accordance with FASB ASC 205.