CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Condensed Consolidated Statements Of Operations [Abstract]
Revenue	$ 894,186	$ 931,627	$ 1,758,451	$ 1,862,863
Costs of revenue:
Direct costs	606,672	639,649	1,208,094	1,285,286
Indirect costs and selling expenses	204,830	209,068	393,540	416,691
Depreciation and amortization	16,230	13,328	29,181	26,567
Total costs of revenue	827,732	862,045	1,630,815	1,728,544
Income from operations	66,454	69,582	127,636	134,319
Interest expense and other, net	9,456	6,231	16,844	13,013
Income before income taxes	56,998	63,351	110,792	121,306
Income taxes	22,088	23,371	42,490	45,336
Net income including portion attributable to noncontrolling interest in earnings of joint venture	34,910	39,980	68,302	75,970
Noncontrolling interest in earnings of joint venture	52	(304)	(348)	(586)
Net income attributable to CACI	$ 34,962	$ 39,676	$ 67,954	$ 75,384
Basic earnings per share (in dollars per share)	$ 1.49	$ 1.74	$ 2.91	$ 3.29
Diluted earnings per share (in dollars per share)	$ 1.38	$ 1.69	$ 2.71	$ 3.17
Weighted-average basic shares outstanding (in shares)	23,433	22,852	23,374	22,942
Weighted-average diluted shares outstanding (in shares)	25,297	23,537	25,066	23,758