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Business Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenue from external customers $ 814,726 $ 864,265
Net income attributable to CACI 31,130 32,992
Reportable Geographical Components | Domestic
    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenue from external customers 779,531 830,875
Net income attributable to CACI 28,686 30,680
Reportable Geographical Components | International
    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenue from external customers 35,195 33,390
Net income attributable to CACI $ 2,444 $ 2,312