Condensed Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011
Condensed Consolidated Statements Of Operations [Abstract]
Revenue	$ 927,962	$ 913,369	$ 2,825,600	$ 2,614,618
Costs of revenue:
Direct costs	632,570	645,404	1,946,899	1,843,410
Indirect costs and selling expenses	208,843	191,403	613,666	555,972
Depreciation and amortization	13,768	14,777	41,894	41,919
Total costs of revenue	855,181	851,584	2,602,459	2,441,301
Income from operations	72,781	61,785	223,141	173,317
Interest expense and other, net	6,175	5,674	18,313	17,498
Income before income taxes	66,606	56,111	204,828	155,819
Income taxes	25,475	19,397	80,304	56,781
Net income including portion attributable to noncontrolling interest in earnings of joint venture	41,131	36,714	124,524	99,038
Noncontrolling interest in earnings of joint venture	(275)	(287)	(467)	(721)
Net income attributable to CACI	$ 40,856	$ 36,427	$ 124,057	$ 98,317
Basic earnings per share	$ 1.54	$ 1.20	$ 4.54	$ 3.24
Diluted earnings per share	$ 1.45	$ 1.16	$ 4.37	$ 3.16
Weighted-average basic shares outstanding	26,537	30,373	27,303	30,321
Weighted-average diluted shares outstanding	28,086	31,300	28,402	31,102