| Document and Entity Information | Jan. 25, 2023 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jan. 25, 2023 |
| Entity Registrant Name | CACI International Inc |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-31400 |
| Entity Tax Identification Number | 54-1345888 |
| Entity Address, Address Line One | 12021 Sunset Hills Road |
| Entity Address, City or Town | Reston |
| Entity Address, State or Province | VA |
| Entity Address, Postal Zip Code | 20190 |
| City Area Code | 703 |
| Local Phone Number | 841-7800 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000016058 |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | CACI |
| Security Exchange Name | NYSE |
