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	276,968	276,968			276,968
Stock-based compensation expense	30,564	30,564		30,564
Tax withholdings on restricted share vestings (in shares)			99,000
Tax withholdings on restricted share vestings	(14,081)	(14,081)	$ 10	(14,091)
Other comprehensive (loss) income, net of tax	7,671	7,671				7,671
Repurchases of common stock	(272,401)	(272,401)		(50,414)			$ (221,987)
Repurchases of common stock (in shares)							750,000
Treasury stock issued under stock purchase plans	7,376	7,376		64			$ 7,312
Treasury stock issued under stock purchase plans (in shares)							(28,000)
Ending balance (in shares) at Mar. 31, 2023			42,919,000
Ending balance at Mar. 31, 2023	3,089,640	3,089,505	$ 4,292	537,773	3,832,849	(23,405)	$ (1,262,004)	135
Ending balance (in shares) at Mar. 31, 2023							20,126,000
Beginning balance (in shares) at Dec. 31, 2022			42,911,000
Beginning balance at Dec. 31, 2022	3,250,246	3,250,111	$ 4,291	578,470	3,732,107	(17,429)	$ (1,047,328)	135
Beginning balance (in shares) at Dec. 31, 2022							19,404,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	100,742	100,742			100,742
Stock-based compensation expense	10,368	10,368		10,368
Tax withholdings on restricted share vestings (in shares)			8,000
Tax withholdings on restricted share vestings	(975)	(975)	$ 1	(976)
Other comprehensive (loss) income, net of tax	(5,976)	(5,976)				(5,976)
Repurchases of common stock	(267,115)	(267,115)		(50,089)			$ (217,026)
Repurchases of common stock (in shares)							731,000
Treasury stock issued under stock purchase plans	2,350	2,350		0			$ 2,350
Treasury stock issued under stock purchase plans (in shares)							(9,000)
Ending balance (in shares) at Mar. 31, 2023			42,919,000
Ending balance at Mar. 31, 2023	$ 3,089,640	3,089,505	$ 4,292	537,773	3,832,849	(23,405)	$ (1,262,004)	135
Ending balance (in shares) at Mar. 31, 2023							20,126,000
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	$ 285,267	285,267			285,267
Stock-based compensation expense	35,016	35,016		35,016
Tax withholdings on restricted share vestings (in shares)			114,000
Tax withholdings on restricted share vestings	(19,710)	(19,710)	$ 12	(19,722)
Other comprehensive (loss) income, net of tax	(7,672)	(7,672)				(7,672)
Repurchases of common stock	(160,071)	(160,071)		51,097			$ (211,168)
Repurchases of common stock (in shares)							641,000
Treasury stock issued under stock purchase plans	$ 8,200	8,200		365			$ 7,835
Treasury stock issued under stock purchase plans (in shares)							(27,000)
Ending balance (in shares) at Mar. 31, 2024	43,037,000		43,037,000
Ending balance at Mar. 31, 2024	$ 3,365,364	3,365,229	$ 4,304	613,090	4,225,883	(12,723)	$ (1,465,325)	135
Ending balance (in shares) at Mar. 31, 2024	20,740,000						20,740,000
Beginning balance (in shares) at Dec. 31, 2023			43,027,000
Beginning balance at Dec. 31, 2023	$ 3,235,624	3,235,489	$ 4,303	602,613	4,110,533	(16,596)	$ (1,465,364)	135
Beginning balance (in shares) at Dec. 31, 2023							20,742,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	115,350	115,350			115,350
Stock-based compensation expense	12,067	12,067		12,067
Tax withholdings on restricted share vestings (in shares)			10,000
Tax withholdings on restricted share vestings	(1,782)	(1,782)	$ 1	(1,783)
Other comprehensive (loss) income, net of tax	3,873	3,873				3,873
Repurchases of common stock	(2,626)	(2,626)		(134)			$ (2,492)
Repurchases of common stock (in shares)							8,000
Treasury stock issued under stock purchase plans	$ 2,858	2,858		327			$ 2,531
Treasury stock issued under stock purchase plans (in shares)							(10,000)
Ending balance (in shares) at Mar. 31, 2024	43,037,000		43,037,000
Ending balance at Mar. 31, 2024	$ 3,365,364	$ 3,365,229	$ 4,304	$ 613,090	$ 4,225,883	$ (12,723)	$ (1,465,325)	$ 135
Ending balance (in shares) at Mar. 31, 2024	20,740,000						20,740,000