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Fair Value of Financial Instruments (Detail Textual) $ in Millions | 6 Months Ended
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Dec. 31, 2018 USD ($)
Fair Value Disclosures [Abstract] |
Business combination contingent consideration period | two and three year periods
Change in fair value of contingent consideration | $ (0.8)

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- Definition Represents business combination contingent consideration period for achieving earnings targets. + References No definition available. + Details
Name: | caci_BusinessCombinationContingentConsiderationPeriod
Namespace Prefix: | caci_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of increase (decrease) of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration