BUSINESS SEGMENT, CUSTOMER AND GEOGRAPHIC INFORMATION (Summarized Financial Information Of Reportable Segments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
Revenue from external customers	$ 905,718	$ 900,393	$ 894,186	$ 864,265	$ 912,931	$ 906,196	$ 931,627	$ 931,236	$ 3,564,562	$ 3,681,990	$ 3,774,473
Net income attributable to CACI	36,534	30,828	34,962	32,992	37,938	38,367	39,676	35,708	135,316	151,689	167,454
Net assets	1,359,166				1,207,572				1,359,166	1,207,572	1,164,445	1,309,616
Goodwill	2,188,569				1,476,965				2,188,569	1,476,965	1,406,953
Total long-term assets	2,623,289				1,773,290				2,623,289	1,773,290	1,702,430
Total assets	3,359,138				2,497,071				3,359,138	2,497,071	2,388,222
Capital expenditures									15,279	15,439	18,284
Depreciation and amortization									65,181	54,078	55,962
Domestic
Revenue from external customers									3,421,544	3,547,459	3,659,367
Net income attributable to CACI									124,599	141,741	159,421
Net assets	1,221,641				1,094,098				1,221,641	1,094,098	1,061,360
Goodwill	2,099,821				1,397,272				2,099,821	1,397,272	1,325,814
Total long-term assets	2,509,992				1,669,585				2,509,992	1,669,585	1,600,726
Total assets	3,170,121				2,333,452				3,170,121	2,333,452	2,233,480
Capital expenditures									13,737	13,667	16,613
Depreciation and amortization									61,207	50,568	52,865
International
Revenue from external customers									143,018	134,531	115,106
Net income attributable to CACI									10,717	9,948	8,033
Net assets	137,525				113,474				137,525	113,474	103,085
Goodwill	88,748				79,693				88,748	79,693	81,139
Total long-term assets	113,297				103,705				113,297	103,705	101,704
Total assets	189,017				163,619				189,017	163,619	154,742
Capital expenditures									1,542	1,772	1,671
Depreciation and amortization									$ 3,974	$ 3,510	$ 3,097