CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Total CACI Shareholders’ Equity	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Noncontrolling Interest
Beginning balance (in shares) at Jun. 30, 2022			42,820,000
Beginning balance at Jun. 30, 2022	$ 3,053,543	$ 3,053,408	$ 4,282	$ 571,650	$ 3,555,881	$ (31,076)	$ (1,047,329)	$ 135
Beginning balance (in shares) at Jun. 30, 2022							19,404,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	176,226	176,226			176,226
Stock-based compensation expense	20,196	20,196		20,196
Tax withholdings on restricted share vestings (in shares)			91,000
Tax withholdings on restricted share vestings	(13,106)	(13,106)	$ 9	(13,115)
Other comprehensive (loss) income, net of tax	13,647	13,647				13,647
Repurchases of common stock	(5,286)	(5,286)		(325)			$ (4,961)
Repurchases of common stock (in shares)							19,000
Treasury stock issued under stock purchase plans	5,026	5,026		64			$ 4,962
Treasury stock issued under stock purchase plans (in shares)							(19,000)
Ending balance (in shares) at Dec. 31, 2022			42,911,000
Ending balance at Dec. 31, 2022	3,250,246	3,250,111	$ 4,291	578,470	3,732,107	(17,429)	$ (1,047,328)	135
Ending balance (in shares) at Dec. 31, 2022							19,404,000
Beginning balance (in shares) at Sep. 30, 2022			42,826,000
Beginning balance at Sep. 30, 2022	3,148,570	3,148,435	$ 4,283	579,511	3,645,006	(33,036)	$ (1,047,329)	135
Beginning balance (in shares) at Sep. 30, 2022							19,404,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	87,101	87,101			87,101
Stock-based compensation expense	11,757	11,757		11,757
Tax withholdings on restricted share vestings (in shares)			85,000
Tax withholdings on restricted share vestings	(12,671)	(12,671)	$ 8	(12,679)
Other comprehensive (loss) income, net of tax	15,607	15,607				15,607
Repurchases of common stock	(2,639)	(2,639)		(143)			$ (2,496)
Repurchases of common stock (in shares)							10,000
Treasury stock issued under stock purchase plans	2,521	2,521		24			$ 2,497
Treasury stock issued under stock purchase plans (in shares)							(10,000)
Ending balance (in shares) at Dec. 31, 2022			42,911,000
Ending balance at Dec. 31, 2022	$ 3,250,246	3,250,111	$ 4,291	578,470	3,732,107	(17,429)	$ (1,047,328)	135
Ending balance (in shares) at Dec. 31, 2022							19,404,000
Beginning balance (in shares) at Jun. 30, 2023	42,923,000		42,923,000
Beginning balance at Jun. 30, 2023	$ 3,224,334	3,224,199	$ 4,292	546,334	3,940,616	(5,051)	$ (1,261,992)	135
Beginning balance (in shares) at Jun. 30, 2023	20,126,000						20,126,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 169,917	169,917			169,917
Stock-based compensation expense	22,949	22,949		22,949
Tax withholdings on restricted share vestings (in shares)			104,000
Tax withholdings on restricted share vestings	(17,928)	(17,928)	$ 11	(17,939)
Other comprehensive (loss) income, net of tax	(11,545)	(11,545)				(11,545)
Repurchases of common stock	(157,445)	(157,445)		51,231			$ (208,676)
Repurchases of common stock (in shares)							633,000
Treasury stock issued under stock purchase plans	$ 5,342	5,342		38			$ 5,304
Treasury stock issued under stock purchase plans (in shares)							(17,000)
Ending balance (in shares) at Dec. 31, 2023	43,027,000		43,027,000
Ending balance at Dec. 31, 2023	$ 3,235,624	3,235,489	$ 4,303	602,613	4,110,533	(16,596)	$ (1,465,364)	135
Ending balance (in shares) at Dec. 31, 2023	20,742,000						20,742,000
Beginning balance (in shares) at Sep. 30, 2023			42,929,000
Beginning balance at Sep. 30, 2023	$ 3,164,033	3,163,898	$ 4,293	594,885	4,026,663	(8,820)	$ (1,453,123)	135
Beginning balance (in shares) at Sep. 30, 2023							20,703,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	83,870	83,870			83,870
Stock-based compensation expense	12,925	12,925		12,925
Tax withholdings on restricted share vestings (in shares)			98,000
Tax withholdings on restricted share vestings	(17,331)	(17,331)	$ 10	(17,341)
Other comprehensive (loss) income, net of tax	(7,776)	(7,776)				(7,776)
Repurchases of common stock	(2,788)	(2,788)		12,144			$ (14,932)
Repurchases of common stock (in shares)							48,000
Treasury stock issued under stock purchase plans	$ 2,691	2,691					$ 2,691
Treasury stock issued under stock purchase plans (in shares)							(9,000)
Ending balance (in shares) at Dec. 31, 2023	43,027,000		43,027,000
Ending balance at Dec. 31, 2023	$ 3,235,624	$ 3,235,489	$ 4,303	$ 602,613	$ 4,110,533	$ (16,596)	$ (1,465,364)	$ 135
Ending balance (in shares) at Dec. 31, 2023	20,742,000						20,742,000