Document And Entity Information - USD ($)	12 Months Ended
	Jun. 30, 2022	Jul. 27, 2022	Dec. 31, 2021
Cover [Abstract]
Entity Registrant Name	CACI International Inc
Entity Central Index Key	0000016058
Trading Symbol	CACI
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Current Fiscal Year End Date	--06-30
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Entity Common Stock, Shares Outstanding		23,417,481
Entity Public Float			$ 6,235,243,074
ICFR Auditor Attestation Flag	true
Document Type	10-K
Document Period End Date	Jun. 30, 2022
Amendment Flag	false
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity File Number	001-31400
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
Entity Interactive Data Current	Yes
Entity Incorporation, State or Country Code	DE
Document Annual Report	true
Document Transition Report	false
Title of 12(b) Security	Common Stock
Security Exchange Name	NYSE
Auditor Firm ID	42
Documents Incorporated by Reference	Part III of this Form 10-K incorporates by reference certain information from the Registrant’s Proxy Statement to be filed with the Securities Exchange Commission (SEC) pursuant to Regulation 14A for the 2022 Annual Meeting of Stockholders.
Auditor Name	Ernst & Young LLP
Auditor Location	Tysons, Virginia