Consolidated Statements Of Shareholders' Equity (USD $) In Thousands	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total CACI Shareholders' Equity [Member]	Noncontrolling Interest In Joint Venture [Member]	Total
Beginning balance at Jun. 30, 2010		$ 3,937	$ 468,959	$ 794,277	$ (9,807)	$ (86,653)	$ 1,170,713	$ 2,442	$ 1,173,155
Beginning balance, shares 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			3,669	3,843		3,843
Post-retirement benefit costs					(24)		(24)		(24)
Net distributions to noncontrolling interest								(692)	(692)
Ending balance at Jun. 30, 2011		4,027	504,156	938,495	(3,115)	(136,631)	1,306,932	2,684	1,309,616
Ending balance, shares 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					(1,332)		(1,332)		(1,332)
Repurchases of common stock, shares						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			218	4,514		4,514
Post-retirement benefit costs					(282)		(282)		(282)
Net distributions to noncontrolling interest								(991)	(991)
Ending balance at Jun. 30, 2012		4,062	525,121	1,105,949	(7,834)	(465,303)	1,161,995	2,450	1,164,445
Ending balance, shares at Jun. 30, 2012		40,626				15,988
Net income attributable to CACI				151,689			151,689		151,689
Noncontrolling interest in earnings of joint venture								987	987
Stock-based compensation expense			8,832				8,832		8,832
Exercise of stock options and vesting of restricted stock units, shares		546
Exercise of stock options and vesting of restricted stock units		55	(5,191)				(5,136)		(5,136)
Currency translation adjustment					(2,567)		(2,567)		(2,567)
Change in fair value of interest rate swap agreements					262		262		262
Repurchases of common stock, shares						2,059
Repurchases of common stock						(115,201)	(115,201)		(115,201)
Treasury stock issued under stock purchase plans, shares						(97)
Treasury stock issued under stock purchase plans			1,392			3,313	4,705		4,705
Post-retirement benefit costs					324		324		324
Net distributions to noncontrolling interest								(768)	(768)
Ending balance at Jun. 30, 2013		$ 4,117	$ 530,154	$ 1,257,638	$ (9,815)	$ (577,191)	$ 1,204,903	$ 2,669	$ 1,207,572
Ending balance, shares at Jun. 30, 2013		41,172				17,950