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Document And Entity Information - USD ($)
 12 Months Ended
Jun. 30, 2017
Aug. 15, 2017
Dec. 31, 2016
Document And Entity Information [Abstract]      
Entity Registrant Name CACI INTERNATIONAL INC /DE/    
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   24,461,695  
Entity Public Float     $ 2,983,255,314
Document Type 10-K    
Document Period End Date Jun. 30, 2017    
Amendment Flag false    
Document Fiscal Year Focus 2017    
Document Fiscal Period Focus FY