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Sales of Receivables (Detail Textual) $ in Millions	Dec. 27, 2019 USD ($)
MARPA
MARPA maturity date	Dec. 24, 2020
MARPA maximum commitment	$ 200.0

Transfer of financial assets accounted for as sales.

No definition available.

Name:	caci_TransferOfFinancialAssetsAccountedForAsSalesAbstract
Namespace Prefix:	caci_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

MARPA maturity date.

No definition available.

Name:	caci_TransfersOfFinancialAssetsAccountedForAsSalesMarpaMaturityDate
Namespace Prefix:	caci_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

MARPA maximum commitment.

No definition available.

Name:	caci_TransfersOfFinancialAssetsAccountedForAsSalesMarpaMaximumCommitment
Namespace Prefix:	caci_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant