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Intangible Assets - Summary of Intangible Assets (Parenthetical) (Detail) $ in Millions | 3 Months Ended
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Sep. 30, 2018 USD ($)
Finite Lived Intangible Assets Net [Abstract] |
Removal of fully amortized intangible assets | $ 0.1

X
- Definition Write-Off of Fully Amortized Intangible Assets. + References No definition available. + Details
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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