Cover - shares	9 Months Ended
	Mar. 28, 2025	Apr. 30, 2025
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 28, 2025
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(g) Security	Common Stock, par value $0.01 per share
Trading Symbol	MRCY
Security Exchange Name	NASDAQ
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
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		59,754,960
Entity Central Index Key	0001049521
Current Fiscal Year End Date	--06-27
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q3
Amendment Flag	false