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Business Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Dec. 31, 2012
segment
Dec. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenue from external customers $ 931,627 $ 973,243 $ 973,243 $ 1,862,863 $ 1,897,638
Net income attributable to CACI 39,676 41,061 41,061 75,384 83,201
Number of operating segments       2  
Domestic [Member]
          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenue from external customers 897,346   948,235 1,795,630 1,844,956
Net income attributable to CACI 37,010   39,434 70,417 79,829
International [Member]
          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenue from external customers 34,281   25,008 67,233 52,682
Net income attributable to CACI $ 2,666   $ 1,627 $ 4,967 $ 3,372