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EARNINGS PER SHARE - Computation Of Earnings Per Share And Weighted Average Number Of Basic And Diluted Shares (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
 [1]
Mar. 31, 2014
 [1]
Dec. 31, 2013
 [1]
Sep. 30, 2013
 [1]
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2013
Earnings Per Share [Abstract]                      
Net income attributable to CACI $ 41,384 $ 29,039 $ 24,642 $ 31,130 $ 36,534 $ 30,828 $ 34,962 $ 32,992 $ 126,195 $ 135,316 $ 151,689
Weighted-average number of basic shares outstanding during the period 24,180,000 24,165,000 23,890,000 23,565,000 23,498,000 23,473,000 23,433,000 23,314,000 23,948,000 23,429,000 23,010,000
Dilutive effect of SSARs/stock options and RSUs/restricted shares after application of treasury stock method                 384 441 743
Dilutive effect of the Convertible Notes                   1,046 132
Dilutive effect of the Warrants                 56,000 239,000  
Weighted-average number of diluted shares outstanding during the period 24,613,000 24,527,000 24,314,000 24,104,000 24,517,000 25,973,000 25,297,000 24,835,000 24,388,000 25,155,000 23,885,000
Basic earnings per share (in dollars per share) $ 1.71 $ 1.20 $ 1.03 $ 1.32 $ 1.55 $ 1.31 $ 1.49 $ 1.42 $ 5.27 $ 5.78 $ 6.59
Diluted earnings per share (in dollars per share) $ 1.68 $ 1.18 $ 1.01 $ 1.29 $ 1.49 $ 1.19 $ 1.38 $ 1.33 $ 5.17 $ 5.38 $ 6.35
[1] Six3 Systems, Inc. was acquired on November 15, 2013.