Consolidated Statements Of Shareholders' Equity (USD $) In Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total CACI Shareholders' Equity [Member]	Noncontrolling Interest In Joint Venture [Member]	Treasury Stock [Member]	Total
BALANCE at Jun. 30, 2009	$ 3,909	$ 425,993	$ 687,762	$ (3,248)	$ 1,027,733	$ 1,875	$ (86,683)	$ 1,029,608
Shares, Outstanding, BALANCE at Jun. 30, 2009	39,091						9,118
Net income attributable to CACI			106,515		106,515			106,515
Noncontrolling interest in earnings of joint venture						743		743
Stock-based compensation expense		30,750			30,750			30,750
Exercise of stock options and vesting of restricted stock units, shares	275
Exercise of stock options and vesting of restricted stock units	28	4,554			4,582			4,582
Adjustment for unrecognized tax benefit		7,775			7,775			7,775
Currency translation adjustment				(7,751)	(7,751)			(7,751)
Change in fair value of interest rate swap agreements, net				1,045	1,045			1,045
Repurchases of common stock, shares							75
Repurchases of common stock					(3,496)		(3,496)	(3,496)
Treasury stock issued under stock purchase plans, shares							(76)
Treasury stock issued under stock purchase plans		(113)			3,413		3,526	3,413
Post-retirement benefit costs				147	147			147
Net distributions to noncontrolling interest						(176)		(176)
BALANCE at Jun. 30, 2010	3,937	468,959	794,277	(9,807)	1,170,713	2,442	(86,653)	1,173,155
Shares, Outstanding, BALANCE at Jun. 30, 2010	39,366						9,117
Net income attributable to CACI			144,218		144,218			144,218
Noncontrolling interest in earnings of joint venture						934		934
Stock-based compensation expense		17,915			17,915			17,915
Exercise of stock options and vesting of restricted stock units, shares	907
Exercise of stock options and vesting of restricted stock units	90	16,773			16,863			16,863
Adjustment for unrecognized tax benefit		335			335			335
Currency translation adjustment				6,716	6,716			6,716
Repurchases of common stock, shares							1,041
Repurchases of common stock					(53,647)		(53,647)	(53,647)
Treasury stock issued under stock purchase plans, shares							(81)
Treasury stock issued under stock purchase plans		174			3,843		3,669	3,843
Post-retirement benefit costs				(24)	(24)			(24)
Net distributions to noncontrolling interest						(692)		(692)
BALANCE at Jun. 30, 2011	4,027	504,156	938,495	(3,115)	1,306,932	2,684	(136,631)	1,309,616
Shares, Outstanding, BALANCE at Jun. 30, 2011	40,273						10,077
Net income attributable to CACI			167,454		167,454			167,454
Noncontrolling interest in earnings of joint venture						757		757
Stock-based compensation expense		15,499			15,499			15,499
Exercise of stock options and vesting of restricted stock units, shares	353
Exercise of stock options and vesting of restricted stock units	35	1,170			1,205			1,205
Currency translation adjustment				(3,105)	(3,105)			(3,105)
Change in fair value of interest rate swap agreements, net				(1,332)	(1,332)			(1,332)
Repurchases of common stock, shares							6,000	6,000
Repurchases of common stock					(328,890)		(328,890)	(328,890)
Treasury stock issued under stock purchase plans, shares							(89)
Treasury stock issued under stock purchase plans		4,296			4,514		218	4,514
Post-retirement benefit costs				(282)	(282)			(282)
Net distributions to noncontrolling interest						(991)		(991)
BALANCE at Jun. 30, 2012	$ 4,062	$ 525,121	$ 1,105,949	$ (7,834)	$ 1,161,995	$ 2,450	$ (465,303)	$ 1,164,445
Shares, Outstanding, BALANCE at Jun. 30, 2012	40,626						15,988