Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Consolidated Statements Of Operations [Abstract]
Revenue	$ 3,774,473	$ 3,577,780	$ 3,149,131
Costs of revenue:
Direct costs	2,598,890	2,528,660	2,207,574
Indirect costs and selling expenses	819,772	741,652	693,736
Depreciation and amortization	55,962	56,067	53,039
Total costs of revenue	3,474,624	3,326,379	2,954,349
Income from operations	299,849	251,401	194,782
Interest expense and other, net	24,101	23,144	26,353
Income before income taxes	275,748	228,257	168,429
Income taxes	107,537	83,105	61,171
Net income including portion attributable to noncontrolling interest in earnings of joint venture	168,211	145,152	107,258
Noncontrolling interest in earnings of joint venture	(757)	(934)	(743)
Net income attributable to CACI	$ 167,454	$ 144,218	$ 106,515
Basic earnings per share	$ 6.18	$ 4.76	$ 3.53
Diluted earnings per share	$ 5.96	$ 4.61	$ 3.47
Weighted-average basic shares outstanding	27,077	30,281	30,138
Weighted-average diluted shares outstanding	28,111	31,300	30,676