CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Total CACI Shareholders' Equity	Noncontrolling Interest	Total
Beginning balance at Jun. 30, 2013		$ 4,117	$ 530,154	$ 1,257,638	$ (9,815)	$ (577,191)	$ 1,204,903	$ 2,669	$ 1,207,572
Beginning balance, shares at Jun. 30, 2013		41,172				17,950
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to CACI				135,316			135,316		135,316
Noncontrolling interest								603	603
Stock-based compensation expense			11,557				11,557		11,557
Exercise of stock options and vesting of restricted stock units		$ 27	(4,414)				(4,387)		(4,387)
Exercise of stock options and vesting of restricted stock units (in shares)		269
Change in fair value of interest rate swap agreements, net					(3,643)		(3,643)		(3,643)
Currency translation adjustment					13,333		13,333		13,333
Repurchases of common stock						$ (3,495)	(3,495)		(3,495)
Repurchases of common stock (in shares)						53
Acquisition of common stock from call option, value			106,799			$ (106,799)
Acquisition of common stock from call option (in shares)						1,431
Treasury stock issued for conversion of the Convertible Notes			(106,799)			$ 106,799
Treasury stock issued for conversion of the Convertible Notes (in shares)						(1,431)
Treasury stock issued under stock purchase plans			37			$ 3,519	3,556		3,556
Treasury stock issued under stock purchase plans (in shares)						(62)
Post-retirement benefit costs					(257)		(257)		(257)
Net distributions to noncontrolling interest								(989)	(989)
Ending balance at Jun. 30, 2014		$ 4,144	537,334	1,392,954	(382)	$ (577,167)	1,356,883	2,283	1,359,166
Ending balance, shares at Jun. 30, 2014		41,441				17,941
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to CACI				126,195			126,195		126,195
Noncontrolling interest								101	101
Stock-based compensation expense			14,072				14,072		14,072
Exercise of stock options and vesting of restricted stock units		$ 18	(2,862)				(2,844)		(2,844)
Exercise of stock options and vesting of restricted stock units (in shares)		181
Lapse of statute of limitations for uncertain tax position			438				438		438
Change in fair value of interest rate swap agreements, net					(2,398)		(2,398)		(2,398)
Currency translation adjustment					(11,943)		(11,943)		(11,943)
Repurchases of common stock			(158)			$ (3,242)	(3,400)		(3,400)
Repurchases of common stock (in shares)						44
Treasury stock issued upon settlement of warrants, value			(973)			$ 964	(9)		(9)
Treasury stock issued upon settlement of warrants (in shares)						(498)
Treasury stock issued under stock purchase plans			128			$ 3,252	3,380		3,380
Treasury stock issued under stock purchase plans (in shares)						(49)
Post-retirement benefit costs					(237)		(237)		(237)
Net distributions to noncontrolling interest								(2,249)	(2,249)
Ending balance at Jun. 30, 2015		$ 4,162	547,979	1,519,149	(14,960)	$ (576,193)	1,480,137	135	1,480,272
Ending balance, shares at Jun. 30, 2015		41,622				17,438
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to CACI				142,799			142,799		142,799
Noncontrolling interest
Stock-based compensation expense			17,919				17,919		17,919
Exercise of stock options and vesting of restricted stock units		$ 14	(7,465)				(7,451)		(7,451)
Exercise of stock options and vesting of restricted stock units (in shares)		136
Change in fair value of interest rate swap agreements, net					(5,992)		(5,992)		(5,992)
Currency translation adjustment					(19,961)		(19,961)		(19,961)
Repurchases of common stock			(192)			$ (3,038)	(3,230)		(3,230)
Repurchases of common stock (in shares)						37
Treasury stock issued under stock purchase plans			83			$ 3,044	3,127		3,127
Treasury stock issued under stock purchase plans (in shares)						(40)
Post-retirement benefit costs					(170)		(170)		(170)
Net distributions to noncontrolling interest
Ending balance at Jun. 30, 2016		$ 4,176	$ 558,324	$ 1,661,948	$ (41,083)	$ (576,187)	$ 1,607,178	$ 135	$ 1,607,313
Ending balance, shares at Jun. 30, 2016		41,758				17,435