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Business Segment Information - Summary of financial information concerning reportable segments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenue from external customers $ 822,442 $ 814,726
Net income attributable to CACI 33,802 31,130
Reportable Geographical Components | Domestic    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenue from external customers 785,678 779,531
Net income attributable to CACI 31,138 28,686
Reportable Geographical Components | International    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenue from external customers 36,764 35,195
Net income attributable to CACI $ 2,664 $ 2,444