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Business Segment Information (Summarized Financial Information Of Reportable Segments) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue from external customers $ 973,243 $ 867,278 $ 1,897,638 $ 1,701,249
Net income attributable to CACI 41,061 33,235 83,201 61,890
Domestic [Member]
        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue from external customers 948,235 838,695 1,844,956 1,644,430
Net income attributable to CACI 39,434 31,443 79,829 58,548
International [Member]
        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue from external customers 25,008 28,583 52,682 56,819
Net income attributable to CACI $ 1,627 $ 1,792 $ 3,372 $ 3,342