CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Condensed Consolidated Statements Of Operations [Abstract]
Revenue	$ 977,274	$ 817,797	$ 2,630,153	$ 2,447,946
Costs of revenue:
Direct costs	647,489	542,841	1,732,053	1,626,139
Indirect costs and selling expenses	249,477	205,174	668,321	610,407
Depreciation and amortization	16,632	16,067	46,113	50,098
Total costs of revenue	913,598	764,082	2,446,487	2,286,644
Income from operations	63,676	53,715	183,666	161,302
Interest expense and other, net	11,115	8,473	28,477	26,153
Income before income taxes	52,561	45,242	155,189	135,149
Income taxes	18,533	16,185	57,021	50,199
Net income	34,028	29,057	98,168	84,950
Noncontrolling interest		(18)		(139)
Net income attributable to CACI	$ 34,028	$ 29,039	$ 98,168	$ 84,811
Basic earnings per share (in dollars per share)	$ 1.40	$ 1.20	$ 4.05	$ 3.55
Diluted earnings per share (in dollars per share)	$ 1.38	$ 1.18	$ 3.98	$ 3.49
Weighted-average basic shares outstanding (in shares)	24,277	24,165	24,243	23,871
Weighted-average diluted shares outstanding (in shares)	24,716	24,527	24,675	24,313