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								12 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
Earnings Per Share [Abstract]
Net income attributable to CACI	$ 37,938	$ 38,367	$ 39,676	$ 35,708	$ 43,397	$ 40,856	$ 41,061	$ 42,140	$ 151,689	$ 167,454	$ 144,218
Weighted average number of basic shares outstanding during the period	23,136	23,021	22,852	23,032	26,407	26,537	26,450	28,915	23,010	27,077	30,281
Dilutive effect of SSARs/stock options and RSUs/restricted shares after application of treasury stock method									743	879	816
Dilutive effect of the Notes									132	111	203
Dilutive effect of the accelerated share repurchase agreement										44
Weighted average number of diluted shares outstanding during the period	24,318	23,706	23,537	23,980	27,247	28,086	27,270	29,842	23,885	28,111	31,300
Basic earnings per share	$ 1.64	$ 1.67	$ 1.74	$ 1.55	$ 1.64	$ 1.54	$ 1.55	$ 1.46	$ 6.59	$ 6.18	$ 4.76
Diluted earnings per share	$ 1.56	$ 1.62	$ 1.69	$ 1.49	$ 1.59	$ 1.45	$ 1.51	$ 1.41	$ 6.35	$ 5.96	$ 4.61