CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Revenue	$ 4,354,617	$ 3,744,053	$ 3,313,452
Costs of revenue:
Direct costs	2,934,804	2,487,633	2,193,585
Indirect costs and selling expenses	1,050,792	926,918	817,403
Depreciation and amortization	71,760	64,752	66,083
Total costs of revenue	4,057,356	3,479,303	3,077,071
Income from operations	297,261	264,750	236,381
Interest expense and other, net	48,642	41,138	34,758
Income before income taxes	248,619	223,612	201,623
Income taxes	84,948	80,813	75,327
Net income	163,671	142,799	126,296
Noncontrolling interest			(101)
Net income attributable to CACI	$ 163,671	$ 142,799	$ 126,195
Basic earnings per share	$ 6.71	$ 5.89	$ 5.27
Diluted earnings per share	$ 6.53	$ 5.76	$ 5.17
Weighted-average basic shares outstanding	24,401	24,262	23,948
Weighted-average diluted shares outstanding	25,069	24,802	24,388