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Description of Business	3 Months Ended
Description of Business	Sep. 27, 2019
Accounting Policies [Abstract]
Description of Business	Description of Business Mercury Systems, Inc. (the “Company” or “Mercury”) is a leading commercial provider of secure sensor and safety-critical mission processing subsystems. Headquartered in Andover, Massachusetts, the Company is delivering solutions that power a broad range of critical aerospace, commercial aviation, defense and intelligence programs, configured and optimized for mission success in some of the most challenging and demanding environments. The Company's innovative next-generation defense electronics business model is designed to meet the industry’s current and emerging technology and business needs by delivering affordable state-of-the-art solutions, rapid time-to-value, service and support to the Company's 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, a testament to its deep domain expertise and culture of innovation.