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
	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]
Net income attributable to CACI	$ 31,130	$ 32,992
Weighted average number of basic shares outstanding during the period	23,565	23,314
Dilutive effect of SSARs/stock options and RSUs after application of treasury stock method	408	526
Diluted effect of the Convertible Notes		995
Dilutive effect of the Warrants	131
Weighted average number of diluted shares outstanding during the period	24,104	24,835
Basic earnings per share (in dollars per share)	$ 1.32	$ 1.42
Diluted earnings per share (in dollars per share)	$ 1.29	$ 1.33