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Intangible Assets - Summary of Intangible Assets (Parenthetical) (Detail) $ in Millions | 9 Months Ended
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Mar. 31, 2020 USD ($)
Finite Lived Intangible Assets Net [Abstract] |
Removal of fully amortized intangible assets | $ 17.6

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