Document And Entity Information - shares	9 Months Ended
	Mar. 31, 2019	Apr. 22, 2019
Document And Entity Information [Abstract]
Entity Registrant Name	CACI INTERNATIONAL INC /DE/
Entity Central Index Key	0000016058
Trading Symbol	caci
Current Fiscal Year End Date	--06-30
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		24,870,769
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3