CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Condensed Consolidated Statements Of Operations [Abstract]
Revenue	$ 830,437	$ 815,423	$ 1,652,879	$ 1,630,149
Costs of revenue:
Direct costs	547,140	546,694	1,084,564	1,083,298
Indirect costs and selling expenses	213,144	204,406	418,844	405,233
Depreciation and amortization	14,670	16,795	29,481	34,031
Total costs of revenue	774,954	767,895	1,532,889	1,522,562
Income from operations	55,483	47,528	119,990	107,587
Interest expense and other, net	8,180	8,600	17,362	17,680
Income before income taxes	47,303	38,928	102,628	89,907
Income taxes	16,965	14,292	38,488	34,014
Net income	30,338	24,636	64,140	55,893
Noncontrolling interest		6		(121)
Net income attributable to CACI	$ 30,338	$ 24,642	$ 64,140	$ 55,772
Basic earnings per share (in dollars per share)	$ 1.25	$ 1.03	$ 2.65	$ 2.35
Diluted earnings per share (in dollars per share)	$ 1.23	$ 1.01	$ 2.60	$ 2.30
Weighted-average basic shares outstanding (in shares)	24,246	23,890	24,227	23,728
Weighted-average diluted shares outstanding (in shares)	24,681	24,314	24,655	24,210