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Cover Page - USD ($)
$ in Billions
 12 Months Ended
Jun. 28, 2024
Jul. 31, 2024
Dec. 29, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Jun. 28, 2024    
Document Transition Report false    
Entity File Number 001-41194    
Entity Registrant Name MERCURY SYSTEMS, INC    
Entity Incorporation, State or Country Code MA    
Entity Tax Identification Number 04-2741391    
Entity Address, Address Line One 50 Minuteman Road    
Entity Address, City or Town Andover    
Entity Address, State or Province MA    
Entity Address, Postal Zip Code 01810    
City Area Code 978    
Local Phone Number 256-1300    
Title of 12(b) Security Common Stock, Par Value $0.01 Per Share    
Trading Symbol MRCY    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 2.2
Entity Common Stock, Shares Outstanding   59,406,416  
Documents Incorporated by Reference
Portions of the registrant’s definitive Proxy Statement for its 2024 Annual Meeting of Shareholders are incorporated by reference into Part III of this report.
Exhibit Index on Page 8 		   
Amendment Flag false    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001049521    
Current Fiscal Year End Date --06-28