v3.5.0.2
Document and Entity Information - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2016
Jul. 31, 2016
Dec. 31, 2015
Document Documentand Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jun. 30, 2016    
Document Fiscal Year Focus 2016    
Document Fiscal Period Focus FY    
Trading Symbol MRCY    
Entity Registrant Name MERCURY SYSTEMS INC    
Entity Central Index Key 0001049521    
Current Fiscal Year End Date --06-30    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Accelerated Filer    
Entity Common Stock, Shares Outstanding   40,360,389  
Entity Public Float     $ 639.6