CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Total CACI Shareholders' Equity	Noncontrolling Interest
Beginning balance at Jun. 30, 2019	$ 2,371,466	$ 4,231	$ 576,277	$ 2,410,164	$ (43,156)	$ (576,185)	$ 2,371,331	$ 135
Beginning balance, shares at Jun. 30, 2019		42,314				17,434
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	321,480			321,480			321,480
Stock-based compensation expense	29,302		29,302				29,302
Tax withholdings on restricted share vestings	(31,271)	$ 22	(31,293)				(31,271)
Tax withholdings on restricted share vestings (in shares)		211
Other comprehensive income (loss), net of tax	(29,129)				(29,129)		(29,129)
Repurchases of common stock	(7,806)		(622)			$ (7,184)	(7,806)
Repurchases of common stock (in shares)						34
Treasury stock issued under stock purchase plans	7,268		80			$ 7,188	7,268
Treasury stock issued under stock purchase plans (in shares)						(36)
Ending balance at Jun. 30, 2020	2,661,310	$ 4,253	573,744	2,731,644	(72,285)	$ (576,181)	2,661,175	135
Ending balance, shares at Jun. 30, 2020		42,525				17,432
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	457,443			457,443			457,443
Stock-based compensation expense	30,463		30,463				30,463
Tax withholdings on restricted share vestings	(19,719)	$ 15	(19,734)				(19,719)
Tax withholdings on restricted share vestings (in shares)		151
Other comprehensive income (loss), net of tax	35,994				35,994		35,994
Repurchases of common stock	(509,137)		(100,232)			$ (408,905)	(509,137)
Repurchases of common stock (in shares)						1,731
Treasury stock issued under stock purchase plans	8,924		19			$ 8,905	8,924
Treasury stock issued under stock purchase plans (in shares)						(41)
Ending balance at Jun. 30, 2021	2,665,278	$ 4,268	484,260	3,189,087	(36,291)	$ (976,181)	2,665,143	135
Ending balance, shares at Jun. 30, 2021		42,676				19,122
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	366,794			366,794			366,794
Stock-based compensation expense	31,732		31,732				31,732
Tax withholdings on restricted share vestings	(14,869)	$ 14	(14,883)				(14,869)
Tax withholdings on restricted share vestings (in shares)		144
Other comprehensive income (loss), net of tax	5,215				5,215		5,215
Repurchases of common stock	(9,785)		70,477			$ (80,262)	(9,785)
Repurchases of common stock (in shares)						318
Treasury stock issued under stock purchase plans	9,178		64			$ 9,114	9,178
Treasury stock issued under stock purchase plans (in shares)						(36)
Ending balance at Jun. 30, 2022	$ 3,053,543	$ 4,282	$ 571,650	$ 3,555,881	$ (31,076)	$ (1,047,329)	$ 3,053,408	$ 135
Ending balance, shares at Jun. 30, 2022		42,820				19,404