Sales of Receivables - MARPA Activity (Details) - USD ($) $ in Thousands	12 Months Ended
Jun. 30, 2025	Jun. 30, 2024
Transfer of Financial Assets Accounted for as Sales [Roll Forward]
Beginning balance sold to Purchaser	$ 250,000	$ 200,000
Sales of receivables	3,902,102	3,471,335
Cash collections	(3,863,193)	(3,421,335)
Ending balance sold to Purchaser	288,909	250,000
Cash collected, not remitted to Purchaser	(96,391)	(110,750)
Remaining sold receivables	192,518	139,250
Cash provided (used) by MARPA	$ 38,900	$ 50,000

Cash provided (used) by MARPA.

No definition available.

Name:	caci_CashProvidedByUsedFromMARPA
Namespace Prefix:	caci_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount outstanding as of the balance sheet date for sales of receivables under the MARPA Facility.

+ References

No definition available.

+ Details

Name:	caci_TransferOfFinancialAssetsAccountedForAsSalesAmountOutstanding
Namespace Prefix:	caci_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Remaining sold receivables under the MARPA Facility.

+ References

No definition available.

+ Details

Name:	caci_TransferOfFinancialAssetsAccountedForAsSalesRemainingSoldReceivables
Namespace Prefix:	caci_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Transfer of Financial Assets Accounted for as Sales

+ References

No definition available.

+ Details

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

- Definition

Amount of cash collected and remitted to the Purchaser as of the balance sheet date for sales of receivables under the MARPA Facility.

+ References

No definition available.

+ Details

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

- Definition

Cash collections not remitted to the Purchaser for sales of receivables under the MARPA Facility.

+ References

No definition available.

+ Details

Name:	caci_TransfersOfFinancialAssetsAccountedForAsSalesCashCollectedNotRemittedToPurchaser
Namespace Prefix:	caci_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of derecognized financial assets from transactions which comprise an initial transfer and an agreement entered into in contemplation of the initial transfer resulting in retention of substantially all of the exposure to the economic return throughout the term of the transaction, at the date of derecognition.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 4D
-Subparagraph (a)
-SubTopic 20
-Topic 860
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481326/860-20-50-4D

+ Details

Name:	us-gaap_TransferOfFinancialAssetsAccountedForAsSalesAmountDerecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant