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Sales of Receivables - Summary of MARPA Activity (Parentheticals) (Detail) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Transfers And Servicing Of Financial Assets [Abstract]
Cash provided (used) by MARPA	$ 11.5	$ (15.8)

X

- Definition

Cash provided (used) by MARPA.

+ References

No definition available.

+ Details

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