Cybersecurity Risk Management and Strategy Disclosure	12 Months Ended
Jun. 30, 2025
Cybersecurity Risk Management, Strategy, and Governance [Line Items]
Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]	Risk Management and Strategy CACI is committed to maintaining a robust cybersecurity management and oversight program to mitigate cybersecurity risks to our systems and to protect both our and our customers' confidential and sensitive information. We employ technologies and have implemented programs and processes to continually assess, identify, and manage cybersecurity risks as we aim to incorporate industry best practices throughout our cybersecurity program. CACI’s cybersecurity program is integrated into our overall risk management program and is primarily managed by our Chief Information Security Officer (CISO) who is responsible for coordinating cross-functional internal and external resources to establish processes and procedures to monitor potential cybersecurity risks, identify cybersecurity incidents, implement appropriate mitigation measures, report cybersecurity breaches, and maintain our cybersecurity program. Our CISO has extensive experience assessing and managing cybersecurity programs and cybersecurity risk and monitors prevention, detection, mitigation, and remediation efforts through regular communication and reporting from experienced cybersecurity professionals in the information security team, supplemented by technological tools and software. We continuously monitor cybersecurity threats and assess the robustness of our mitigation and prevention measures through routine internal and independent audits, threat simulations, vulnerability and penetration testing, and employee cybersecurity training. Our cybersecurity program is designed to be aligned with applicable industry standards, and we continue to invest in capabilities to protect all information assets in our possession. As a government contractor, we have designed our cybersecurity risk management program to align with the National Institute of Standards and Technology (NIST) standards and comply with extensive regulations, including but not limited to U.S. government cybersecurity regulations. Additionally, our cybersecurity program is routinely assessed by the government, and our network is penetration tested biannually by a third-party independent assessor. We work closely with our subcontractors and suppliers to identify and manage cybersecurity risks. We require them to comply with applicable laws and regulations, including implementing certain security controls and complying with certain reporting obligations. Although we perform due diligence on all service providers to identify potential cybersecurity risks and establish controls through onboarding procedures and contractual requirements, our ability to monitor the cybersecurity practices of our service providers and ensure that we can prevent or mitigate the risk of any compromise or failure in the information system, software, networks, and other assets owned or controlled by our vendors is limited. In the event of a cybersecurity incident, the Company has established an incident response plan to address the matter promptly and effectively. Our CISO leads our Cybersecurity Incident Response Team (CIRT) that is responsible for leading and coordinating CACI’s response to cybersecurity incidents in accordance with CACI’s established cybersecurity incident response plan and response processes. In accordance with these policies, cybersecurity events and data incidents are evaluated, ranked by severity, and prioritized for escalation to CACI’s Executive Incident Assessment Committee. The plan includes procedures for investigating and containing incidents, notifying affected parties, and implementing corrective actions to prevent future occurrences.
Cybersecurity Risk Management Processes Integrated [Flag]	true
Cybersecurity Risk Management Processes Integrated [Text Block]	CACI is committed to maintaining a robust cybersecurity management and oversight program to mitigate cybersecurity risks to our systems and to protect both our and our customers' confidential and sensitive information. We employ technologies and have implemented programs and processes to continually assess, identify, and manage cybersecurity risks as we aim to incorporate industry best practices throughout our cybersecurity program.
Cybersecurity Risk Management Third Party Engaged [Flag]	true
Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]	true
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]	false
Cybersecurity Risk Board of Directors Oversight [Text Block]	The Audit and Risk Committee (Audit Committee) has oversight responsibility for risks and incidents relating to cybersecurity, including compliance with regulatory requirements, cooperation with law enforcement, and related effects on financial and other risks. The Audit Committee receives regular briefings on our cybersecurity posture, cybersecurity trends, and cybersecurity risks from management and, if they occur, is briefed regarding any material cybersecurity incidents. The Audit Committee reports any findings or recommendations to the Board of Directors, as appropriate.
Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]	The Audit and Risk Committee (Audit Committee) has oversight responsibility for risks and incidents relating to cybersecurity, including compliance with regulatory requirements, cooperation with law enforcement, and related effects on financial and other risks.
Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]	The Audit Committee receives regular briefings on our cybersecurity posture, cybersecurity trends, and cybersecurity risks from management and, if they occur, is briefed regarding any material cybersecurity incidents. The Audit Committee reports any findings or recommendations to the Board of Directors, as appropriate
Cybersecurity Risk Role of Management [Text Block]	The Audit and Risk Committee (Audit Committee) has oversight responsibility for risks and incidents relating to cybersecurity, including compliance with regulatory requirements, cooperation with law enforcement, and related effects on financial and other risks. The Audit Committee receives regular briefings on our cybersecurity posture, cybersecurity trends, and cybersecurity risks from management and, if they occur, is briefed regarding any material cybersecurity incidents. The Audit Committee reports any findings or recommendations to the Board of Directors, as appropriate.
Cybersecurity Risk Management Positions or Committees Responsible [Flag]	true
Cybersecurity Risk Management Positions or Committees Responsible [Text Block]	The Audit and Risk Committee (Audit Committee) has oversight responsibility for risks and incidents relating to cybersecurity, including compliance with regulatory requirements, cooperation with law enforcement, and related effects on financial and other risks. The Audit Committee receives regular briefings on our cybersecurity posture, cybersecurity trends, and cybersecurity risks from management and, if they occur, is briefed regarding any material cybersecurity incidents. The Audit Committee reports any findings or recommendations to the Board of Directors, as appropriate
Cybersecurity Risk Management Expertise of Management Responsible [Text Block]	Our CISO has extensive experience assessing and managing cybersecurity programs and cybersecurity risk and monitors prevention, detection, mitigation, and remediation efforts through regular communication and reporting from experienced cybersecurity professionals in the information security team, supplemented by technological tools and software.
Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]	In the event of a cybersecurity incident, the Company has established an incident response plan to address the matter promptly and effectively. Our CISO leads our Cybersecurity Incident Response Team (CIRT) that is responsible for leading and coordinating CACI’s response to cybersecurity incidents in accordance with CACI’s established cybersecurity incident response plan and response processes. In accordance with these policies, cybersecurity events and data incidents are evaluated, ranked by severity, and prioritized for escalation to CACI’s Executive Incident Assessment Committee. The plan includes procedures for investigating and containing incidents, notifying affected parties, and implementing corrective actions to prevent future occurrences
Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]	true

Cybersecurity Risk Management and Strategy Disclosure

12 Months Ended

Jun. 30, 2025

Cybersecurity Risk Management, Strategy, and Governance [Line Items]

Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]

Risk Management and Strategy

CACI is committed to maintaining a robust cybersecurity management and oversight program to mitigate cybersecurity risks to our systems and to protect both our and our customers' confidential and sensitive information. We employ technologies and have implemented programs and processes to continually assess, identify, and manage cybersecurity risks as we aim to incorporate industry best practices throughout our cybersecurity program.

CACI’s cybersecurity program is integrated into our overall risk management program and is primarily managed by our Chief Information Security Officer (CISO) who is responsible for coordinating cross-functional internal and external resources to establish processes and procedures to monitor potential cybersecurity risks, identify cybersecurity incidents, implement appropriate mitigation measures, report cybersecurity breaches, and maintain our cybersecurity program. Our CISO has extensive experience assessing and managing cybersecurity programs and cybersecurity risk and monitors prevention, detection, mitigation, and remediation efforts through regular communication and reporting from experienced cybersecurity professionals in the information security team, supplemented by technological tools and software. We continuously monitor cybersecurity threats and assess the robustness of our mitigation and prevention measures through routine internal and independent audits, threat simulations, vulnerability and penetration testing, and employee cybersecurity training. Our cybersecurity program is designed to be aligned with applicable industry standards, and we continue to invest in capabilities to protect all information assets in our possession.

As a government contractor, we have designed our cybersecurity risk management program to align with the National Institute of Standards and Technology (NIST) standards and comply with extensive regulations, including but not limited to U.S. government cybersecurity regulations. Additionally, our cybersecurity program is routinely assessed by the government, and our network is penetration tested biannually by a third-party independent assessor. We work closely with our subcontractors and suppliers to identify and manage cybersecurity risks. We require them to comply with applicable laws and regulations, including implementing certain security controls and complying with certain reporting obligations. Although we perform due diligence on all service providers to identify potential cybersecurity risks and establish controls through onboarding procedures and contractual requirements, our ability to monitor the cybersecurity practices of our service providers and ensure that we can prevent or mitigate the risk of any compromise or failure in the information system, software, networks, and other assets owned or controlled by our vendors is limited.

In the event of a cybersecurity incident, the Company has established an incident response plan to address the matter promptly and effectively. Our CISO leads our Cybersecurity Incident Response Team (CIRT) that is responsible for leading and coordinating CACI’s response to cybersecurity incidents in accordance with CACI’s established cybersecurity incident response plan and response processes. In accordance with these policies, cybersecurity events and data incidents are evaluated, ranked by severity, and prioritized for escalation to CACI’s Executive Incident Assessment Committee. The plan includes procedures for investigating and containing incidents, notifying affected parties, and implementing corrective actions to prevent future occurrences.

Cybersecurity Risk Management Processes Integrated [Flag]

true

Cybersecurity Risk Management Processes Integrated [Text Block]

Cybersecurity Risk Management Third Party Engaged [Flag]

true

Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]

true

Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]

false

Cybersecurity Risk Board of Directors Oversight [Text Block]

The Audit and Risk Committee (Audit Committee) has oversight responsibility for risks and incidents relating to cybersecurity, including compliance with regulatory requirements, cooperation with law enforcement, and related effects on financial and other risks. The Audit Committee receives regular briefings on our cybersecurity posture, cybersecurity trends, and cybersecurity risks from management and, if they occur, is briefed regarding any material cybersecurity incidents. The Audit Committee reports any findings or recommendations to the Board of Directors, as appropriate.

Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]

Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]

The Audit Committee receives regular briefings on our cybersecurity posture, cybersecurity trends, and cybersecurity risks from management and, if they occur, is briefed regarding any material cybersecurity incidents. The Audit Committee reports any findings or recommendations to the Board of Directors, as appropriate

Cybersecurity Risk Role of Management [Text Block]

Cybersecurity Risk Management Positions or Committees Responsible [Flag]

true

Cybersecurity Risk Management Positions or Committees Responsible [Text Block]

Cybersecurity Risk Management Expertise of Management Responsible [Text Block]

Our CISO has extensive experience assessing and managing cybersecurity programs and cybersecurity risk and monitors prevention, detection, mitigation, and remediation efforts through regular communication and reporting from experienced cybersecurity professionals in the information security team, supplemented by technological tools and software.

Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]

Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]

true