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INTANGIBLE ASSETS - Summary of Intangible Assets (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Finite Lived Intangible Assets Net [Abstract]
Removal of fully amortized intangible assets	$ 1.5	$ 264.1

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- Definition

Write-Off of Fully Amortized Intangible Assets.

+ References

No definition available.

+ Details

Name:	caci_WriteOffOfFullyAmortizedIntangibleAssets
Namespace Prefix:	caci_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsNetAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration