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Business Segment Information (Tables)
 6 Months Ended
Dec. 31, 2011
Business Segment Information [Abstract]  
Summarized Financial Information Of Reportable Segments
             
  Domestic International Total
Three Months Ended December 31, 2011            
Revenue from external customers $ 948,235 $ 25,008 $ 973,243
Net income attributable to CACI   39,434   1,627   41,061
Three Months Ended December 31, 2010            
Revenue from external customers $ 838,695 $ 28,583 $ 867,278
Net income attributable to CACI   31,443   1,792   33,235
Six Months Ended December 31, 2011            
Revenue from external customers $ 1,844,956 $ 52,682 $ 1,897,638
Net income attributable to CACI   79,829   3,372   83,201
Six Months Ended December 31, 2010            
Revenue from external customers $ 1,644,430 $ 56,819 $ 1,701,249
Net income attributable to CACI   58,548   3,342   61,890