CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
Revenue	$ 3,744,053	$ 3,313,452	$ 3,564,562
Costs of revenue:
Direct costs	2,487,633	2,193,585	2,426,520
Indirect costs and selling expenses	926,918	817,403	815,458
Depreciation and amortization	64,752	66,083	65,181
Total costs of revenue	3,479,303	3,077,071	3,307,159
Income from operations	264,750	236,381	257,403
Interest expense and other, net	41,138	34,758	38,158
Income before income taxes	223,612	201,623	219,245
Income taxes	80,813	75,327	83,326
Net income	142,799	126,296	135,919
Noncontrolling interest		(101)	(603)
Net income attributable to CACI	$ 142,799	$ 126,195	$ 135,316
Basic earnings per share (in dollars per share)	$ 5.89	$ 5.27	$ 5.78
Diluted earnings per share (in dollars per share)	$ 5.76	$ 5.17	$ 5.38
Weighted-average basic shares outstanding (in shares)	24,262	23,948	23,429
Weighted-average diluted shares outstanding (in shares)	24,802	24,388	25,155