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Business Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Mar. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue from external customers $ 900,393 $ 906,196 $ 2,658,844 $ 2,769,059
Net income attributable to CACI 30,828 38,367 98,782 113,751
Reportable Geographical Components | Domestic
        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue from external customers 863,531 872,037 2,551,863 2,667,667
Net income attributable to CACI 28,002 36,193 90,916 106,610
Reportable Geographical Components | International
        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue from external customers 36,862 34,159 106,981 101,392
Net income attributable to CACI $ 2,826 $ 2,174 $ 7,866 $ 7,141