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		9 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011
Earnings Per Share [Abstract]
Net income attributable to CACI	$ 40,856	$ 36,427	$ 124,057	$ 98,317
Weighted average number of basic shares outstanding during the period	26,537	30,373	27,303	30,321
Dilutive effect of SSARs/stock options and RSUs/restricted shares after application of treasury stock method	932	712	893	709
Dilutive effect of the Notes	441	215	148	72
Dilutive effect of the accelerated share repurchase	176		58
Weighted average number of diluted shares outstanding during the period	28,086	31,300	28,402	31,102
Basic earnings per share	$ 1.54	$ 1.20	$ 4.54	$ 3.24
Diluted earnings per share	$ 1.45	$ 1.16	$ 4.37	$ 3.16