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]	Noncontrolling Interest In Joint Venture [Member]		Treasury Stock [Member]	Total
Beginning Balance at Jun. 30, 2008		$ 3,895	$ 416,337	[1]	$ 598,064	[1]	$ 6,768	$ 995	[1]	$ (66,992)	$ 959,067	[1]
Shares, Outstanding, Beginning Balance at Jun. 30, 2008		38,948								8,731
Net income attributable to CACI	[1]				89,698						89,698	[2]
Noncontrolling interest in earnings of joint venture	[1]							719			719	[2]
Stock-based compensation expense	[1]		16,821								16,821	[3]
Exercise of stock options and vesting of restricted stock units, shares		143
Exercise of stock options and vesting of restricted stock units		14	(240)	[1]							(226)	[1]
Adjustment for unrecognized tax benefit	[1]		(6,682)								(6,682)
Currency translation adjustment							(9,616)				(9,616)	[1],[3]
Change in fair value of interest rate swap agreements							(332)				(332)	[1],[3]
Repurchases of common stock, shares										482
Repurchases of common stock										(23,705)	(23,705)	[1],[3]
Treasury stock issued under stock purchase plans, shares										(95)
Treasury stock issued under stock purchase plans			(243)	[1]						4,014	3,771	[1]
Post-retirement benefit costs							(68)				(68)	[1]
Stockholders' equity, Other	[1]							161			161
Ending Balance at Jun. 30, 2009		3,909	425,993	[1]	687,762	[1]	(3,248)	1,875	[1]	(86,683)	1,029,608	[1]
Shares, Outstanding, Ending Balance at Jun. 30, 2009		39,091								9,118
Net income attributable to CACI	[1]				106,515						106,515
Noncontrolling interest in earnings of joint venture	[1]							743			743
Stock-based compensation expense	[1]		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	[1]							4,582	[1]
Adjustment for unrecognized tax benefit	[1]		7,775								7,775
Currency translation adjustment							(7,751)				(7,751)	[1]
Change in fair value of interest rate swap agreements							1,045				1,045	[1]
Repurchases of common stock, shares										75
Repurchases of common stock										(3,496)	(3,496)	[1]
Treasury stock issued under stock purchase plans, shares										(76)
Treasury stock issued under stock purchase plans			(113)	[1]						3,526	3,413	[1]
Post-retirement benefit costs							147				147	[1]
Net distributions to noncontrolling interest	[1]							(176)			(176)
Ending Balance at Jun. 30, 2010		3,937	468,959	[1]	794,277	[1]	(9,807)	2,442	[1]	(86,653)	1,173,155	[1]
Shares, Outstanding, Ending Balance at Jun. 30, 2010		39,366								9,117
Net income attributable to CACI	[1]				144,218						144,218
Noncontrolling interest in earnings of joint venture	[1]							934			934
Stock-based compensation expense	[1]		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	[1]							16,863	[1]
Adjustment for unrecognized tax benefit	[1]		335								335
Currency translation adjustment							6,716				6,716	[1]
Repurchases of common stock, shares										1,041
Repurchases of common stock										(53,647)	(53,647)	[1]
Treasury stock issued under stock purchase plans, shares										(81)
Treasury stock issued under stock purchase plans			174	[1]						3,669	3,843	[1]
Post-retirement benefit costs							(24)				(24)	[1]
Net distributions to noncontrolling interest	[1]							(692)			(692)
Ending Balance at Jun. 30, 2011		$ 4,027	$ 504,156	[1]	$ 938,495	[1]	$ (3,115)	$ 2,684	[1]	$ (136,631)	$ 1,309,616	[1]
Shares, Outstanding, Ending Balance at Jun. 30, 2011		40,273								10,077

[1] Certain amounts as of and for the years ended June 30, 2008 and 2009 have been adjusted to reflect the retroactive application of new accounting standards. See Note 3.

[2] Certain amounts for the year ended June 30, 2009 have been adjusted to reflect the retroactive application of new accounting standards. See Note 3.

[3] Certain amounts for the year ended June 30, 2009 have been adjusted to reflect the retroactive application of new accounting standards. See Note 3.