Cybersecurity Risk Management and Strategy Disclosure	12 Months Ended
Mar. 31, 2026
Cybersecurity Risk Management, Strategy, and Governance [Line Items]
Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]	Risk Management and Strategy We have developed and implemented cybersecurity risk management processes intended to protect the confidentiality, integrity, and availability of our critical systems and information. While everyone at our company plays a part in managing cybersecurity risks, primary cybersecurity oversight responsibility is shared by our board of directors, the Risk Committee, and senior management. Our cybersecurity risk management program is a part of our overall enterprise risk management program. Our cybersecurity risk management program includes: •physical, technological, and administrative controls intended to support our cybersecurity and data governance framework, including protections designed to protect the confidentiality, integrity, and availability of our key information systems and customer, employee, partner, and other third-party information stored on those systems, such as access controls, encryption, data handling requirements, and other cybersecurity safeguards, and internal policies that govern our cybersecurity risk management and data protection practices; •a defined procedure for timely incident detection, containment, response, and remediation, including a written security incident response plan that includes procedures for responding to cybersecurity incidents; •cybersecurity risk assessment processes designed to help identify material cybersecurity risks to our critical systems, information, products, services, and broader enterprise IT environment; •a security team responsible for managing our cybersecurity risk assessment processes and security controls; •the use of external consultants or other third-party experts and service providers, where considered appropriate, to assess, test, or otherwise assist with aspects of our cybersecurity controls; •annual cybersecurity and privacy training of employees, including incident response personnel and senior management, and specialized training for certain teams depending on their role and/or access to certain types of information, such as consumer information; and •a third-party risk management process that includes internal vetting of certain third-party vendors and service providers with whom we may share data. Over the past fiscal year we have not identified risks from known cybersecurity threats (including as a result of those two cybersecurity incidents) which have materially affected or are reasonably likely to materially affect us, including our operations, business strategy, operating results, or financial condition. We continue to monitor and assess our cybersecurity risk management program as well as invest in and seek to improve such systems and processes as appropriate. If we were to experience a material cybersecurity incident in the future, such incident may have a material effect, including on our operations, business strategy, operating results, or financial condition. For more information regarding cybersecurity risks that we face and their potential impacts on our business related, see "Item 3.D: Risk Factors."
Cybersecurity Risk Management Processes Integrated [Flag]	true
Cybersecurity Risk Management Processes Integrated [Text Block]	We have developed and implemented cybersecurity risk management processes intended to protect the confidentiality, integrity, and availability of our critical systems and information. While everyone at our company plays a part in managing cybersecurity risks, primary cybersecurity oversight responsibility is shared by our board of directors, the Risk Committee, and senior management. Our cybersecurity risk management program is a part of our overall enterprise risk management program. Our cybersecurity risk management program includes: •physical, technological, and administrative controls intended to support our cybersecurity and data governance framework, including protections designed to protect the confidentiality, integrity, and availability of our key information systems and customer, employee, partner, and other third-party information stored on those systems, such as access controls, encryption, data handling requirements, and other cybersecurity safeguards, and internal policies that govern our cybersecurity risk management and data protection practices; •a defined procedure for timely incident detection, containment, response, and remediation, including a written security incident response plan that includes procedures for responding to cybersecurity incidents; •cybersecurity risk assessment processes designed to help identify material cybersecurity risks to our critical systems, information, products, services, and broader enterprise IT environment; •a security team responsible for managing our cybersecurity risk assessment processes and security controls; •the use of external consultants or other third-party experts and service providers, where considered appropriate, to assess, test, or otherwise assist with aspects of our cybersecurity controls; •annual cybersecurity and privacy training of employees, including incident response personnel and senior management, and specialized training for certain teams depending on their role and/or access to certain types of information, such as consumer information; and •a third-party risk management process that includes internal vetting of certain third-party vendors and service providers with whom we may share data.
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]	With oversight from our Board, the Risk Committee and Audit Committee have collective primary responsibility to assist the Board fulfill its ultimate oversight responsibilities relating to risk assessment and management, including relating to cybersecurity and other information technology risks. The Risk Committee oversees our enterprise risk management as a whole, with its primary focus being system and operational risk, information and cybersecurity risk, reputational risk, and business continuity risk, while the risks relating to financial matters, such as financial reporting and internal controls, liquidity, credit and market risk, and legal and compliance, are the priorities of the Audit Committee with respect to its oversight role for enterprise risk management. The Committee Chair of the Risk Committee has an ongoing dialogue with the Committee Chair of the Audit Committee to coordinate these priorities and allocations regarding each committee’s responsibilities. The Risk Committee oversees management’s implementation of our cybersecurity risk management program, including processes and policies for determining risk tolerance, and reviews management’s strategies for adequately mitigating and managing identified risks, including risks relating to cybersecurity threats. The Risk Committee currently meets periodically, and reports to our Board regarding its activities, including those related to key cybersecurity risks, on a quarterly basis or more frequently as needed. The cybersecurity experience of the Committee Chair of the Risk Committee includes having served (i) in a variety of positions at PricewaterhouseCoopers LLP (PwC) in the United States from 1998 to 2018, including Principal and Global Cyber Security Leader and Principal and U.S. and Global Advisory Cyber Leader, and (ii) as Principal and Americas Cyber Leader at Ernst & Young LLP from April 2018 to February 2024, and he currently serves, since March 2024, as Global Group Head, Cyber and Data Resilience, at Kroll, LLC. Coincheck has its own comprehensive risk management structure, including for cybersecurity, and its own risk committee, chaired by Coincheck’s Chairman, as well as a dedicated chief risk officer (sometimes also referred to internally as chief risk management officer) who has been in charge of day-to-day oversight of risk management, including cybersecurity and information technology risk, and reports to Coincheck’s risk committee chair. In addition to his experience since 2017 at various Monex companies and Coincheck, which has included acting as a corporate auditor, executive officer and director, and day-to-day oversight of risk management, with a focus on technology, this chief risk officer has experience and degrees in both law and trading, including as a trading manager at Goldman Sachs and Deutsche Bank, which included responsibility for implementation of regulations of the Bank of International Settlements. Coincheck Parent also has a Head of Internal Audit whose duties include focusing on internal control related to cybersecurity and information technology, including attendance and participation in relevant meetings and discussions. Her experience includes conducting assessments regarding general information technology (IT) and automated controls under JICPA and PCAOB standards, implementing computer-assisted audit techniques (CAATs) for risk assessment, sampling and fraud detection, and vendor security assessments for six years at Deloitte Touche Tohmatsu LLC in Japan, and over six years of similar experience at Deloitte Touche LLP in New York, including leading a nine-person team conducting IT control assessment under PCAOB regarding 300 automated controls in a complex IT environment with over 200 application systems, and supervising an eight-person team to deliver internal audit support services for general IT and automated controls. 3iQ also maintains its own cybersecurity risk-management framework appropriate to a regulated investment fund manager, including custody-side controls implemented by third-party qualified custodians, vendor-management policies and an information-security policy overseen by 3iQ’s Chief Compliance Officer and Vice President, Legal. The Risk Committee receives periodic updates from members of management, including management of the Company subsidiaries, on our cybersecurity risks, and management updates, as necessary, regarding any material cybersecurity threats or incidents, as well as any incidents with lesser impact potential. Our management team is responsible for assessing and managing our material risks from cybersecurity threats and for our overall cybersecurity risk management program on a day-to-day basis, and supervises both our internal cybersecurity personnel and the relationship with our retained external cybersecurity consultants, including our efforts to prevent, detect, mitigate, and remediate cybersecurity risks and incidents through various means. Our management team includes individuals with years of working experience in the cybersecurity field.
Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]	With oversight from our Board, the Risk Committee and Audit Committee have collective primary responsibility to assist the Board fulfill its ultimate oversight responsibilities relating to risk assessment and management, including relating to cybersecurity and other information technology risks.
Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]	The Risk Committee oversees our enterprise risk management as a whole, with its primary focus being system and operational risk, information and cybersecurity risk, reputational risk, and business continuity risk, while the risks relating to financial matters, such as financial reporting and internal controls, liquidity, credit and market risk, and legal and compliance, are the priorities of the Audit Committee with respect to its oversight role for enterprise risk management. The Committee Chair of the Risk Committee has an ongoing dialogue with the Committee Chair of the Audit Committee to coordinate these priorities and allocations regarding each committee’s responsibilities. The Risk Committee oversees management’s implementation of our cybersecurity risk management program, including processes and policies for determining risk tolerance, and reviews management’s strategies for adequately mitigating and managing identified risks, including risks relating to cybersecurity threats. The Risk Committee currently meets periodically, and reports to our Board regarding its activities, including those related to key cybersecurity risks, on a quarterly basis or more frequently as needed.
Cybersecurity Risk Role of Management [Text Block]	With oversight from our Board, the Risk Committee and Audit Committee have collective primary responsibility to assist the Board fulfill its ultimate oversight responsibilities relating to risk assessment and management, including relating to cybersecurity and other information technology risks. The Risk Committee oversees our enterprise risk management as a whole, with its primary focus being system and operational risk, information and cybersecurity risk, reputational risk, and business continuity risk, while the risks relating to financial matters, such as financial reporting and internal controls, liquidity, credit and market risk, and legal and compliance, are the priorities of the Audit Committee with respect to its oversight role for enterprise risk management. The Committee Chair of the Risk Committee has an ongoing dialogue with the Committee Chair of the Audit Committee to coordinate these priorities and allocations regarding each committee’s responsibilities. The Risk Committee oversees management’s implementation of our cybersecurity risk management program, including processes and policies for determining risk tolerance, and reviews management’s strategies for adequately mitigating and managing identified risks, including risks relating to cybersecurity threats. The Risk Committee currently meets periodically, and reports to our Board regarding its activities, including those related to key cybersecurity risks, on a quarterly basis or more frequently as needed. The cybersecurity experience of the Committee Chair of the Risk Committee includes having served (i) in a variety of positions at PricewaterhouseCoopers LLP (PwC) in the United States from 1998 to 2018, including Principal and Global Cyber Security Leader and Principal and U.S. and Global Advisory Cyber Leader, and (ii) as Principal and Americas Cyber Leader at Ernst & Young LLP from April 2018 to February 2024, and he currently serves, since March 2024, as Global Group Head, Cyber and Data Resilience, at Kroll, LLC.
Cybersecurity Risk Management Positions or Committees Responsible [Flag]	true
Cybersecurity Risk Management Positions or Committees Responsible [Text Block]	The Risk Committee oversees our enterprise risk management as a whole, with its primary focus being system and operational risk, information and cybersecurity risk, reputational risk, and business continuity risk, while the risks relating to financial matters, such as financial reporting and internal controls, liquidity, credit and market risk, and legal and compliance, are the priorities of the Audit Committee with respect to its oversight role for enterprise risk management. The Committee Chair of the Risk Committee has an ongoing dialogue with the Committee Chair of the Audit Committee to coordinate these priorities and allocations regarding each committee’s responsibilities. The Risk Committee oversees management’s implementation of our cybersecurity risk management program, including processes and policies for determining risk tolerance, and reviews management’s strategies for adequately mitigating and managing identified risks, including risks relating to cybersecurity threats.
Cybersecurity Risk Management Expertise of Management Responsible [Text Block]	The cybersecurity experience of the Committee Chair of the Risk Committee includes having served (i) in a variety of positions at PricewaterhouseCoopers LLP (PwC) in the United States from 1998 to 2018, including Principal and Global Cyber Security Leader and Principal and U.S. and Global Advisory Cyber Leader, and (ii) as Principal and Americas Cyber Leader at Ernst & Young LLP from April 2018 to February 2024, and he currently serves, since March 2024, as Global Group Head, Cyber and Data Resilience, at Kroll, LLC.
Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]	The Risk Committee currently meets periodically, and reports to our Board regarding its activities, including those related to key cybersecurity risks, on a quarterly basis or more frequently as needed.
Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]	true

Cybersecurity Risk Management and Strategy Disclosure

12 Months Ended

Mar. 31, 2026

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

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

Risk Management and Strategy

We have developed and implemented cybersecurity risk management processes intended to protect the confidentiality, integrity, and availability of our critical systems and information. While everyone at our company plays a part in managing cybersecurity risks, primary cybersecurity oversight responsibility is shared by our board of directors, the Risk Committee, and senior management. Our cybersecurity risk management program is a part of our overall enterprise risk management program.

Our cybersecurity risk management program includes:

•physical, technological, and administrative controls intended to support our cybersecurity and data governance framework, including protections designed to protect the confidentiality, integrity, and availability of our key information systems and customer, employee, partner, and other third-party information stored on those systems, such as access controls, encryption, data handling requirements, and other cybersecurity safeguards, and internal policies that govern our cybersecurity risk management and data protection practices;

•a defined procedure for timely incident detection, containment, response, and remediation, including a written security incident response plan that includes procedures for responding to cybersecurity incidents;

•cybersecurity risk assessment processes designed to help identify material cybersecurity risks to our critical systems, information, products, services, and broader enterprise IT environment;

•a security team responsible for managing our cybersecurity risk assessment processes and security controls;

•the use of external consultants or other third-party experts and service providers, where considered appropriate, to assess, test, or otherwise assist with aspects of our cybersecurity controls;

•annual cybersecurity and privacy training of employees, including incident response personnel and senior management, and specialized training for certain teams depending on their role and/or access to certain types of information, such as consumer information; and

•a third-party risk management process that includes internal vetting of certain third-party vendors and service providers with whom we may share data.

Over the past fiscal year we have not identified risks from known cybersecurity threats (including as a result of those two cybersecurity incidents) which have materially affected or are reasonably likely to materially affect us, including our operations, business strategy, operating results, or financial condition. We continue to monitor and assess our cybersecurity risk management program as well as invest in and seek to improve such systems and processes as appropriate. If we were to experience a material cybersecurity incident in the future, such incident may have a material effect, including on our operations, business strategy, operating results, or financial condition. For more information regarding cybersecurity risks that we face and their potential impacts on our business related, see "Item 3.D: Risk Factors."

Cybersecurity Risk Management Processes Integrated [Flag]

true

Cybersecurity Risk Management Processes Integrated [Text Block]

Our cybersecurity risk management program includes:

•cybersecurity risk assessment processes designed to help identify material cybersecurity risks to our critical systems, information, products, services, and broader enterprise IT environment;

•a security team responsible for managing our cybersecurity risk assessment processes and security controls;

•the use of external consultants or other third-party experts and service providers, where considered appropriate, to assess, test, or otherwise assist with aspects of our cybersecurity controls;

•a third-party risk management process that includes internal vetting of certain third-party vendors and service providers with whom we may share data.

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]

With oversight from our Board, the Risk Committee and Audit Committee have collective primary responsibility to assist the Board fulfill its ultimate oversight responsibilities relating to risk assessment and management, including relating to cybersecurity and other information technology risks. The Risk Committee oversees our enterprise risk management as a whole, with its primary focus being system and operational risk, information and cybersecurity risk, reputational risk, and business continuity risk, while the risks relating to financial matters, such as financial reporting and internal controls, liquidity, credit and market risk, and legal and compliance, are the priorities of the Audit Committee with respect to its oversight role for enterprise risk management. The Committee Chair of the Risk Committee has an ongoing dialogue with the Committee Chair of the Audit Committee to coordinate these priorities and allocations regarding each committee’s responsibilities. The Risk Committee oversees management’s implementation of our cybersecurity risk management program, including processes and policies for determining risk tolerance, and reviews management’s strategies for adequately mitigating and managing identified risks, including risks relating to cybersecurity threats. The Risk Committee currently meets periodically, and reports to our Board regarding its activities, including those related to key cybersecurity risks, on a quarterly basis or more frequently as needed. The cybersecurity experience of the Committee Chair of the Risk Committee includes having served (i) in a variety of positions at PricewaterhouseCoopers LLP (PwC) in the United States from 1998 to 2018, including Principal and Global Cyber Security Leader and Principal and U.S. and Global Advisory Cyber Leader, and (ii) as Principal and Americas Cyber Leader at Ernst & Young LLP from April 2018 to February 2024, and he currently serves, since March 2024, as Global Group Head, Cyber and Data Resilience, at Kroll, LLC.

Coincheck has its own comprehensive risk management structure, including for cybersecurity, and its own risk committee, chaired by Coincheck’s Chairman, as well as a dedicated chief risk officer (sometimes also referred to internally as chief risk management officer) who has been in charge of day-to-day oversight of risk management, including cybersecurity and information technology risk, and reports to Coincheck’s risk committee chair. In addition to his experience since 2017 at various Monex companies and Coincheck, which has included acting as a corporate auditor, executive officer and director, and day-to-day oversight of risk management, with a focus on technology, this chief risk officer has experience and degrees in both law and trading, including as a trading manager at Goldman Sachs and Deutsche Bank, which included responsibility for implementation of regulations of the Bank of International Settlements. Coincheck Parent also has a Head of Internal Audit whose duties include focusing on internal control related to cybersecurity and information technology, including attendance and participation in relevant meetings and discussions. Her experience includes conducting assessments regarding general information technology (IT) and automated controls under JICPA and PCAOB standards, implementing computer-assisted audit techniques (CAATs) for risk assessment, sampling and fraud detection, and vendor security assessments for six years at Deloitte Touche Tohmatsu LLC in Japan, and over six years of similar experience at Deloitte Touche LLP in New York, including leading a nine-person team conducting IT control assessment under PCAOB regarding 300 automated controls in a complex IT environment with over 200 application systems, and supervising an eight-person team to deliver internal audit support services for general IT and automated controls.

3iQ also maintains its own cybersecurity risk-management framework appropriate to a regulated investment fund manager, including custody-side controls implemented by third-party qualified custodians, vendor-management policies and an information-security policy overseen by 3iQ’s Chief Compliance Officer and Vice President, Legal.

The Risk Committee receives periodic updates from members of management, including management of the Company subsidiaries, on our cybersecurity risks, and management updates, as necessary, regarding any material cybersecurity threats or incidents, as well as any incidents with lesser impact potential.

Our management team is responsible for assessing and managing our material risks from cybersecurity threats and for our overall cybersecurity risk management program on a day-to-day basis, and supervises both our internal cybersecurity personnel and the relationship with our retained external cybersecurity consultants, including our efforts to prevent, detect, mitigate, and remediate cybersecurity risks and incidents through various means. Our management team includes individuals with years of working experience in the cybersecurity field.

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 Risk Committee oversees our enterprise risk management as a whole, with its primary focus being system and operational risk, information and cybersecurity risk, reputational risk, and business continuity risk, while the risks relating to financial matters, such as financial reporting and internal controls, liquidity, credit and market risk, and legal and compliance, are the priorities of the Audit Committee with respect to its oversight role for enterprise risk management. The Committee Chair of the Risk Committee has an ongoing dialogue with the Committee Chair of the Audit Committee to coordinate these priorities and allocations regarding each committee’s responsibilities. The Risk Committee oversees management’s implementation of our cybersecurity risk management program, including processes and policies for determining risk tolerance, and reviews management’s strategies for adequately mitigating and managing identified risks, including risks relating to cybersecurity threats. The Risk Committee currently meets periodically, and reports to our Board regarding its activities, including those related to key cybersecurity risks, on a quarterly basis or more frequently as needed.

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]

The cybersecurity experience of the Committee Chair of the Risk Committee includes having served (i) in a variety of positions at PricewaterhouseCoopers LLP (PwC) in the United States from 1998 to 2018, including Principal and Global Cyber Security Leader and Principal and U.S. and Global Advisory Cyber Leader, and (ii) as Principal and Americas Cyber Leader at Ernst & Young LLP from April 2018 to February 2024, and he currently serves, since March 2024, as Global Group Head, Cyber and Data Resilience, at Kroll, LLC.

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

The Risk Committee currently meets periodically, and reports to our Board regarding its activities, including those related to key cybersecurity risks, on a quarterly basis or more frequently as needed.

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

true