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Business Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
segment
Mar. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue from external customers $ 906,196 $ 927,962 $ 2,769,059 $ 2,825,600
Net income attributable to CACI 38,367 40,856 113,751 124,057
Number of operating segments     2  
Domestic [Member]
        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue from external customers 872,037 897,403 2,667,667 2,742,359
Net income attributable to CACI 36,193 38,901 106,610 118,730
International [Member]
        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue from external customers 34,159 30,559 101,392 83,241
Net income attributable to CACI $ 2,174 $ 1,955 $ 7,141 $ 5,327