Description of Business	12 Months Ended
Description of Business	Jul. 01, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	Description of Business Mercury Systems, Inc. is a technology company that delivers commercial innovation to rapidly transform the global aerospace and defense industry. Headquartered in Andover, Massachusetts, the Company's end-to-end processing platform enables a broad range of aerospace and defense programs, optimized for mission success in some of the most challenging and demanding environments. Processing technologies that comprise the Company's platform include signal solutions, display, software applications, networking, storage and secure processing. The Company's innovative solutions are mission-ready, trusted and secure, software-defined and open and modular (the Company's differentiators), to meet customers’ most-pressing high-tech needs, including those specific to the defense community. On February 28, 2022, the Company amended its existing revolving credit facility (the "Revolver") to increase and extend the borrowing capacity to a $1,100,000, 5-year revolving credit line, with the maturity extended to February 28, 2027. As of July 1, 2022, there was $451,500 of outstanding borrowings on the Revolver. See Note M in the accompanying consolidated financial statements for further discussion of the Revolver. On November 29, 2021, the Company acquired Atlanta Micro, Inc. ("Atlanta Micro") for a purchase price of $90,000, subject to net working capital and net debt adjustments. Based in Norcross, Georgia, Atlanta Micro is a leading designer and manufacturer of high-performance RF modules and components, including advanced monolithic microwave integrated circuits ("MMICs") which are critical for high-speed data acquisition applications including electronic warfare, radar and weapons. The Company funded the acquisition through its Revolver. On September 27, 2021, the Company signed a definitive agreement to acquire Avalex Technologies (“Avalex”) for a purchase price of $155,000, subject to net working capital and net debt adjustments. On November 5, 2021, the transaction closed and the Company acquired Avalex. Based in Gulf Breeze, Florida, Avalex is a provider of mission-critical avionics, including rugged displays, integrated communications management systems, digital video recorders and warning systems. The Company funded the acquisition with its Revolver. On May 27, 2021, the Company acquired Pentek for a purchase price of $65,000, prior to net working capital and net debt adjustments. Based in Upper Saddle River, New Jersey, Pentek is a leading designer and manufacturer of ruggedized, high-performance, commercial off-the-shelf ("COTS") software-defined radio and data acquisition boards, recording systems and subsystems for high-end commercial and defense applications. The acquisition and associated transaction expenses were funded through a combination of cash on hand and Mercury's existing revolving credit facility (the "Revolver"). On December 30, 2020, the Company acquired Physical Optics Corporation ("POC") for a purchase price of $310,000, prior to net working capital and net debt adjustments. Based in Torrance, California, POC more than doubles Mercury's global avionics business and expands its collective footprint in the platform and mission management market. The Company funded the acquisition through a combination of cash on hand and its existing Revolver. For further details on the acquisitions, see Note C to the consolidated financial statements.