CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Condensed Consolidated Statements Of Operations [Abstract]
Revenue	$ 817,797	$ 900,393	$ 2,447,946	$ 2,658,844
Costs of revenue:
Direct costs	542,841	605,780	1,626,139	1,813,874
Indirect costs and selling expenses	205,174	216,164	610,407	609,704
Depreciation and amortization	16,067	17,917	50,098	47,098
Total costs of revenue	764,082	839,861	2,286,644	2,470,676
Income from operations	53,715	60,532	161,302	188,168
Interest expense and other, net	8,473	11,480	26,153	28,324
Income before income taxes	45,242	49,052	135,149	159,844
Income taxes	16,185	18,043	50,199	60,533
Net income	29,057	31,009	84,950	99,311
Noncontrolling interest	(18)	(181)	(139)	(529)
Net income attributable to CACI	$ 29,039	$ 30,828	$ 84,811	$ 98,782
Basic earnings per share (in dollars per share)	$ 1.20	$ 1.31	$ 3.55	$ 4.22
Diluted earnings per share (in dollars per share)	$ 1.18	$ 1.19	$ 3.49	$ 3.89
Weighted-average basic shares outstanding (in shares)	24,165	23,473	23,871	23,406
Weighted-average diluted shares outstanding (in shares)	24,527	25,973	24,313	25,368