Document And Entity Information - shares	6 Months Ended
	Dec. 31, 2021	Jan. 12, 2022
Cover [Abstract]
Entity Registrant Name	CACI International Inc
Entity Central Index Key	0000016058
Current Fiscal Year End Date	--06-30
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		23,405,590
Document Type	10-Q
Document Period End Date	Dec. 31, 2021
Amendment Flag	false
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q2
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Title of 12(b) Security	Common Stock
Trading Symbol	CACI
Security Exchange Name	NYSE
Entity File Number	001-31400
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	54-1345888
Entity Address, Address Line One	12021 Sunset Hills Road
Entity Address, City or Town	Reston
Entity Address, State or Province	VA
Entity Address, Postal Zip Code	20190
City Area Code	703
Local Phone Number	841-7800
Document Quarterly Report	true
Document Transition Report	false