Earnings Per Share - Computation of earnings per share and weighted average number of basic and diluted shares (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Net income attributable to CACI	$ 34,962	$ 39,676	$ 67,954	$ 75,384
Weighted average number of basic shares outstanding during the period	23,433	22,852	23,374	22,942
Dilutive effect of SSARs/stock options and RSUs/restricted shares after application of treasury stock method	403	685	464	810
Dilutive effect of the Notes and Warrants	1,461		1,228	6
Weighted average number of diluted shares outstanding during the period	25,297	23,537	25,066	23,758
Basic earnings per share (in dollars per share)	$ 1.49	$ 1.74	$ 2.91	$ 3.29
Diluted earnings per share (in dollars per share)	$ 1.38	$ 1.69	$ 2.71	$ 3.17