Document and Entity Information Document Information [Table] Document Information [Line Items] Document and Entity Information Document Type Entity Registrant Name Entity Filer Category Entity Small Business Entity Emerging Growth Company Entity Ex Transition Period Entity Central Index Key Amendment Flag CONDENSED BALANCE SHEETS Statement [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Common Class A [Member] Class A ordinary shares PubCo Series A Common stock Represents information pertaining to class A ordinary shares subject to possible redemption. Class A Ordinary Shares Subject To Possible Redemption [Member] Redeemable Class A Class A ordinary shares subject to redemption Common Class B [Member] Class B ordinary shares Non-redeemable Class B Legal Entity [Axis] All Entities [Member] Represents the information pertaining to Cartesian Growth Corporation III. Cartesian Growth Corporation III [Member] Cartesian Growth Corporation III Statement [Line Items] Statement Statement [Line Items] Assets [Abstract] Assets ASSETS Assets, Current [Abstract] Current assets Current assets: Cash Cash Prepaid Insurance Prepaid insurance - current Amount of asset related to consideration paid excluding insurance, current in advance for costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer. Prepaid Expense Excluding Prepaid Insurance, Current Prepaid expenses Assets, Current Total current assets Deferred Costs, Noncurrent Deferred offering costs Prepaid Expense, Noncurrent Prepaid insurance - long term Asset, Held-in-Trust, Noncurrent Investments held in Trust Account Assets held in the Trust Account Assets Total Assets Liabilities and Equity [Abstract] Liabilities, Class A Ordinary Shares Subject to Possible Redemption, and Shareholders' Deficit LIABILITIES, REDEEMABLE CONVERTIBLE PREFERRED STOCK & STOCKHOLDERS' DEFICIT Liabilities, Current [Abstract] Current Liabilities Current liabilities: Current portion of offering costs attributable to a proposed or actual offering of securities. Accrued Offering Costs, Current Accrued offering costs Accrued Liabilities, Current Accrued expenses Total accrued expenses Liabilities, Current Total current liabilities Amount of cost attributable to offering of securities which are deferred and payable, classified as noncurrent. Deferred Underwriting Fees Payable, Noncurrent Deferred underwriting fee Liabilities Total Liabilities Commitments and Contingencies. Commitments and Contingencies (Note 6) Commitments and contingencies (Note 8) Temporary Equity, Carrying Amount, Attributable to Parent Class A ordinary shares subject to possible redemption, 27,600,000 shares at redemption value of approximately $10.36 and $10.27 per share as of March 31, 2026 and December 31, 2025, respectively Class A ordinary shares subject to possible redemption Equity, Attributable to Parent [Abstract] Shareholders' Deficit Stockholders' deficit: Preferred Stock, Value, Issued Preference shares, $0.0001 par value; 1,000,000 shares authorized; none issued and outstanding Common Stock, Value, Issued Ordinary share, value Common stock, $0.0001 par value; 32,000,000 shares authorized as of March 31, 2026, and December 31, 2025. 5,068,690 and 5,039,438 shares issued and outstanding as of March 31, 2026, and December 31, 2025, respectively Additional Paid in Capital Additional paid-in capital Retained Earnings (Accumulated Deficit) Accumulated deficit Accumulated deficit Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive loss Accumulated other comprehensive (loss) income Treasury Stock, Value Treasury stock, at cost; 108,466 shares as of March 31, 2026, and December 31, 2025 Treasury stock, at cost; 108,466 shares as of December 31, 2025, and 2024 Equity, Attributable to Parent Ending balance Beginning balance Total Shareholders' Deficit Liabilities and Equity Total Liabilities, Class A Ordinary Shares Subject to Possible Redemption, and Shareholders' Deficit Represents information pertaining to Class A ordinary shares not subject to possible redemption. Class A Ordinary Shares Not Subject To Possible Redemption [Member] Class A ordinary shares not subject to redemption Temporary Equity, Shares Outstanding Temporary shares, shares outstanding (in shares) Redeemable convertible preferred stock (in shares) Temporary Equity, Redemption Price Per Share Temporary shares, redemption price per share (In dollars per share) Preferred Stock, Par or Stated Value Per Share Preferred shares , par value (In dollars per share) Preference shares, par value (in dollars per share) Preferred Stock, Shares Authorized Preference shares, shares authorized (in shares) Preferred Stock, Shares Issued Preference shares, shares issued (in shares Preferred Stock, Shares Outstanding Preference shares, shares outstanding (in shares) Common Stock, Par or Stated Value Per Share Ordinary shares, par value (in dollars per share) Par value Common Stock, Shares Authorized Common stock, Shares authorized Ordinary shares, authorized (in shares) Common Stock, Shares, Issued Ending balance (In shares) Beginning balance (In shares) Ordinary shares, shares issued (in shares) Common stock, Shares issued Common Stock, Shares, Outstanding Ending balance (in shares) Beginning balance (in shares) Ordinary shares, outstanding (in shares) Shares outstanding (in shares) CONDENSED STATEMENTS OF OPERATIONS General and Administrative Expense General and administrative costs Operating Income (Loss) Loss from operations Nonoperating Income (Expense) [Abstract] Other income: Other (expense) income, net: Investment Income, Interest Interest earned on marketable securities held in Trust Account Interest earned on investments held in Trust Account Nonoperating Income (Expense) Total other income (expense), net Other income Net Income (Loss) Attributable to Parent Net loss Net income (loss) Net income (loss) Net loss Weighted Average Number of Shares Outstanding, Basic Basic weighted average shares outstanding (In shares) Basic weighted average shares outstanding Weighted Average Number of Shares Outstanding, Diluted Diluted weighted average shares outstanding (In shares) Diluted weighted average shares outstanding Earnings Per Share, Basic Basic net income (loss) per share (In dollars per share) Basic net income (loss) per ordinary share Earnings Per Share, Diluted Diluted net income (loss) per share (In dollars per share) Diluted net income (loss) per ordinary share CONDENSED STATEMENTS OF CHANGES IN SHAREHOLDERS' DEFICIT Equity Components [Axis] Equity Component [Domain] Common Stock [Member] Ordinary Shares COMMON STOCK Additional Paid-in Capital [Member] Additional Paid-in Capital ADDITIONAL PAID-IN CAPITAL Retained Earnings [Member] Accumulated Deficit ACCUMULATED DEFICIT Class of Warrant or Right [Axis] Class of Warrant or Right [Domain] Represents information pertaining to private placement warrants. Private Placement Warrants [Member] Private Placement Warrants Represents information pertaining to public warrants. Public Warrants [Member] Public Warrants Increase (Decrease) in Stockholders' Equity [Roll Forward] STATEMENTS OF CHANGES IN SHAREHOLDERS' DEFICIT Amount of decrease in additional paid in capital and retained earnings for increase in the carrying amount of ordinary shares that are subject to possible redemption and classified as temporary equity. Remeasurement Of Ordinary Shares Subject To Possible Redemption To Redemption Value Remeasurement of Class A ordinary shares to redemption amount Adjustments to Additional Paid in Capital, Warrant Issued Issuance of warrants Amount of decrease in additional paid in capital due to allocation of transaction costs to temporary equity. Adjustments To Additional Paid In Capital, Decrease Due To Allocation Of transaction Costs To Temporary Equity Allocated value of transaction costs to Class A shares Stock Issued During Period, Value, New Issues Aggregate capital contributions Class B ordinary shares issued to Sponsor Stock Issued During Period, Shares, New Issues Class B ordinary shares issued to Sponsor (in shares) Shares issued during the period Related Party Transaction [Axis] Related Party Transaction [Domain] Represents the information pertaining to founder shares. Founders Shares [Member] Founder Shares Related and Nonrelated Parties [Axis] Related and Nonrelated Parties [Domain] Represents information pertaining to sponsor. Sponsor [Member] Sponsor Sale of Stock [Axis] Sale of Stock [Domain] Over-Allotment Option [Member] Over- allotment options Over-allotment option Statistical Measurement [Axis] Statistical Measurement [Domain] Maximum [Member] Maximum Represents the number of warrants issued. Number of Warrants Issued Number of warrants issued Stock Issued During Period, Shares, Issued for Services Number of share issued (in shares) Number of shares subject to forfeiture. Number Of Shares, Subject To Forfeiture Shares subject to forfeiture Number of shares not subject to forfeiture. Number Of Shares, Not Subject To Forfeiture Number of shares not subject to forfeiture by sponsor CONDENSED STATEMENTS OF CASH FLOWS Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Cash Flows from Operating Activities: Cash flows from operating activities: Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net loss Net income (loss) Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Adjustments to reconcile net income (loss) to net cash used in operating activities: Adjustments to reconcile net loss to net cash used in operating activities: Amount of operating costs paid by way of issuance of promissory note. Adjustments For Operating Costs Through Issuance Of Promissory Notes Payment of operation costs through promissory note Amount of formation costs paid by way of issuance of ordinary shares. Adjustments For Formation Costs Through Issuance Of Shares Formation costs paid through issuance of Class B ordinary shares Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Amount of increase (decrease) of consideration paid in advance for insurance that provides economic benefits within twelve months or normal operating cycle, if longer. Increase (Decrease) In Current Prepaid Insurance Prepaid insurance Increase (Decrease) in Prepaid Expense Prepaid expenses Amount of increase (decrease) of consideration paid in advance for insurance that provides economic benefits for more than twelve months or normal operating cycle, if longer. Increase (Decrease) In Long Term Prepaid Insurance Long term prepaid insurance Increase (Decrease) in Accrued Liabilities Accrued expenses Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Cash used in operations Net cash used in operating activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Cash Flows from Investing Activities: Cash flows from investing activities: Amount of cash outflow during the period associated with investments of cash in trust account. Payments For Investments Of Cash In Trust Account Investment of cash in Trust Account Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Net cash used in investing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Cash Flows from Financing Activities: Cash flows from financing activities: Amount of cash inflow associated with the amount received from entity's first offering of stock to the public, net of underwriting fees and discounts. Proceeds From Initial Public Offering, Net Of Underwriting Fees And Discounts Proceeds from sale of Units, net of underwriting discounts paid Proceeds from Issuance of Warrants Proceeds from sale of Private Placements Warrants Repayments of Related Party Debt Repayment of advances from related party Repayments of Notes Payable Repayment of promissory note - related party Payments of Stock Issuance Costs Payment of offering costs Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Net cash provided by financing activities Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Net Change in Cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Cash - End of period Cash - Beginning of period Total cash, cash equivalents and restricted cash Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Non-Cash investing and financing activities: Notes Issued Prepaid services contributed by Sponsor through promissory note - related party Temporary Equity, Accretion to Redemption Value, Adjustment Remeasurement of Class A ordinary shares to redemption value Amount of deferred offering costs paid in exchange for issuance of common stock, during a noncash or partial noncash transaction. Deferred Offering Costs Paid In Exchange for Issuance of Shares Deferred offering costs paid by Sponsor in exchange for issuance of Class B ordinary shares The amount of deferred offering costs included in accrued offering costs that were incurred during a noncash or partial noncash transaction. Deferred Offering Costs Included In Accrued Offering Costs Deferred costs included in accrued offering costs The fair value of notes issued to related parties in noncash investing and financing activities for settlement of deferred offering costs. Deferred Offering Costs Paid Through Promissory Note, Related Party Deferred offering costs paid through promissory note - related party The amount of deferred offering costs applied to prepaid expenses that were incurred during a noncash or partial noncash transaction. Deferred Offering Costs Applied To Prepaid Expense Deferred offering costs applied to prepaid expense The amount of deferred underwriting fees that were incurred during a noncash or partial noncash transaction. Deferred Underwriting Fees Incurred In Noncash Or Partial Noncash Transaction Deferred underwriting fee payable DESCRIPTION OF ORGANIZATION AND BUSINESS OPERATIONS Schedule disclosing information related to description of organization and business operations. Description Of Organization And Business Operations [Table] Description Of Organization And Business Operations [Table] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Description Of Organization And Business Operations [Line items] DESCRIPTION OF ORGANIZATION AND BUSINESS OPERATIONS Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] DESCRIPTION OF ORGANIZATION AND BUSINESS OPERATIONS SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Schedule disclosing information related to summary of significant accounting policies. Summary of Significant Accounting Policies [Table] Schedule disclosing information related to summary of significant accounting policies. Summary of Significant Accounting Policies [Line Items] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES No definition available. INITIAL PUBLIC OFFERING Disclosure of information about initial public offering. Initial Public Offering [Table] Initial Public Offering [Table] INITIAL PUBLIC OFFERING Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Initial Public Offering [Line Items] INITIAL PUBLIC OFFERING The entire disclosure for initial public offering. Initial Public Offering [Text Block] INITIAL PUBLIC OFFERING No definition available. PRIVATE PLACEMENT Schedule disclosing information related to private placement. Private Placement [Table] Private Placement [Table] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Private Placement [Line Items] PRIVATE PLACEMENT The entire disclosure related to private placement. Private Placement [Text Block] PRIVATE PLACEMENT RELATED PARTY TRANSACTIONS Related Party Transaction [Table] Related Party Transaction [Line Items] RELATED PARTY TRANSACTIONS SIGNIFICANT ACCOUNTING POLICIES Related Party Transactions Disclosure [Text Block] RELATED PARTY TRANSACTIONS COMMITMENTS AND CONTINGENCIES Other Commitments [Table] Other Commitments [Line Items] COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] COMMITMENTS AND CONTINGENCIES SHAREHOLDERS' DEFICIT Stock, Class of Stock [Table] Class of Stock [Line Items] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES SHAREHOLDERS' DEFICIT Equity [Text Block] SHAREHOLDERS' DEFICIT COMMON STOCK FAIR VALUE MEASUREMENTS Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Line Items] FAIR VALUE MEASUREMENTS FAIR VALUE MEASURES Fair Value Disclosures [Text Block] FAIR VALUE MEASUREMENTS FAIR VALUE MEASURES SEGMENT INFORMATION Schedule of Segment Reporting Information, by Segment [Table] Segment Reporting Information [Line Items] SEGMENT INFORMATION Segment Reporting Disclosure [Text Block] SEGMENT INFORMATION SUBSEQUENT EVENTS Subsequent Event [Table] Subsequent Event [Line Items] SUBSEQUENT EVENTS Subsequent Events [Text Block] SUBSEQUENT EVENTS Basis of Accounting, Policy [Policy Text Block] Basis of Presentation Principles of Consolidation Disclosure of accounting policy for liquidity and capital resources. Liquidity And Capital Resources, Policy [Policy Text Block] Liquidity and Capital Resources and Going Concern Segment Reporting, Policy [Policy Text Block] Segment Reporting Disclosure of accounting policy for emerging growth company. Emerging Growth Company, Policy [Policy Text Block] Emerging Growth Company Status Use of Estimates, Policy [Policy Text Block] Use of Estimates Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents Cash, Cash Equivalents and Restricted Cash Disclosure of accounting policy for investments held in trust account. Investments Held In Trust Account, Policy [Policy Text Block] Investments Held in Trust Account Concentration Risk, Credit Risk, Policy [Policy Text Block] Concentration of Credit Risk Deferred Charges, Policy [Policy Text Block] Offering Costs Deferred Transaction Costs Fair Value of Financial Instruments, Policy [Policy Text Block] Fair Value of Financial Instruments Income Tax, Policy [Policy Text Block] Income Taxes Disclosure of accounting policy for ordinary shares that are subject to possible redemption. Ordinary Shares Subject To Possible Redemption, Policy [Policy Text Block] Class A Ordinary Shares Subject to Possible Redemption Disclosure of accounting policy for warrant instruments. Warrants Instruments, Policy [Policy Text Block] Warrant Instruments Earnings Per Share, Policy [Policy Text Block] Net Income (Loss) per Ordinary Share Net Loss Per Share New Accounting Pronouncements, Policy [Policy Text Block] Recent Accounting Pronouncements Recently Adopted Accounting Pronouncements and New Accounting Pronouncements - Not Yet Adopted Temporary Equity [Table Text Block] Schedule of Class A ordinary shares subject to possible redemption reflected in the balance sheet Schedule of redeemable convertible preferred stock Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of calculation of basic and diluted net income per ordinary share Schedule of basic and diluted losses per share Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Schedule of company's assets and liabilities that are measured at fair value Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Schedule of quantitative information regarding market assumptions used for valuation of the public and private warrants Schedule of assumptions used to calculate fair value of Warrant liabilities and Convertible promissory notes Tabular disclosure of Market Implied Likelihood Of Completing A Business Combination measurement input determination criteria. Fair Value, Measurement Input Determination Criteria, Market Implied Likelihood Of Completing A Business Combination [Table Text Block] Schedule of criteria for determination of market implied likelihood of completing a business combination Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of segment information Reconciliation of net loss under segment reporting