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Intangible Assets - Summary of Intangible Assets (Parenthetical) (Detail) $ in Millions	6 Months Ended
	Dec. 31, 2018 USD ($)
Finite Lived Intangible Assets Net [Abstract]
Removal of fully amortized intangible assets	$ 0.2

X

- 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

X

- References

No definition available.

+ Details

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