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 at Jun. 30, 2021	$ 2,665,278	$ 2,665,143	$ 4,268	$ 484,260	$ 3,189,087	$ (36,291)	$ (976,181)	$ 135
Beginning balance (in shares) at Jun. 30, 2021			42,676,000
Beginning balance (in shares) at Jun. 30, 2021							19,122,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	273,825	273,825			273,825
Stock-based compensation expense	23,085	23,085		23,085
Tax withholdings on restricted share vestings (in shares)			141,000
Tax withholdings on restricted share vestings	(14,571)	(14,571)	$ 14	(14,585)
Other comprehensive income (loss), net of tax	13,725	13,725				13,725
Repurchases of common stock	(7,301)	(7,301)		70,631			$ (77,932)
Repurchases of common stock (in shares)							310,000
Treasury stock issued under stock purchase plans (in shares)							(28,000)
Treasury stock issued under stock purchase plans	6,845	6,845		61			$ 6,784
Ending balance at Mar. 31, 2022	2,960,886	2,960,751	$ 4,282	563,452	3,462,912	(22,566)	$ (1,047,329)	135
Ending balance (in shares) at Mar. 31, 2022			42,817,000
Ending balance (in shares) at Mar. 31, 2022							19,404,000
Beginning balance at Dec. 31, 2021	2,845,710	2,845,575	$ 4,281	555,968	3,367,495	(34,840)	$ (1,047,329)	135
Beginning balance (in shares) at Dec. 31, 2021			42,810,000
Beginning balance (in shares) at Dec. 31, 2021							19,404,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	95,417	95,417			95,417
Stock-based compensation expense	8,387	8,387		8,387
Tax withholdings on restricted share vestings (in shares)			7,000
Tax withholdings on restricted share vestings	(772)	(772)	$ 1	(773)
Other comprehensive income (loss), net of tax	12,274	12,274				12,274
Repurchases of common stock	(2,306)	(2,306)		(130)			$ (2,176)
Repurchases of common stock (in shares)							9,000
Treasury stock issued under stock purchase plans (in shares)							(9,000)
Treasury stock issued under stock purchase plans	2,176	2,176					$ 2,176
Ending balance at Mar. 31, 2022	2,960,886	2,960,751	$ 4,282	563,452	3,462,912	(22,566)	$ (1,047,329)	135
Ending balance (in shares) at Mar. 31, 2022			42,817,000
Ending balance (in shares) at Mar. 31, 2022							19,404,000
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	42,820,000		42,820,000
Beginning balance (in shares) at Jun. 30, 2022	19,404,000						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 income (loss), 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 (in shares)							(28,000)
Treasury stock issued under stock purchase plans	7,376	7,376		64			$ 7,312
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	42,919,000		42,919,000
Ending balance (in shares) at Mar. 31, 2023	20,126,000						20,126,000
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			42,911,000
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 income (loss), 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 (in shares)							(9,000)
Treasury stock issued under stock purchase plans	2,350	2,350					$ 2,350
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	42,919,000		42,919,000
Ending balance (in shares) at Mar. 31, 2023	20,126,000						20,126,000