Equity Components [Axis] Common Stock [Member] Additional Paid-in Capital [Member] Retained Earnings [Member] Long-Lived Asset, Class [Axis] Computer and Software [Member] Furniture and Fixtures [Member] Computer Equipment [Member] Related and Nonrelated Parties [Axis] Related Party [Member] Product and Service [Axis] Financial Consulting Services [Member] Income Tax Jurisdiction [Axis] Income Tax Jurisdiction, Domestic State and Local [Member] Customer [Axis] Three Customers [Member] Concentration Risk Benchmark [Axis] Revenue Benchmark [Member] Concentration Risk Type [Axis] Customer Concentration Risk [Member] Two Customers [Member] Customer A [Member] Accounts Receivable [Member] Customer B [Member] Customer C [Member] Customer A and B and C [Member] Customer A and B [Member] Cover [Abstract] Document Type Amendment Flag Amendment Description Document Registration Statement Document Annual Report Document Quarterly Report Document Transition Report Document Shell Company Report Document Shell Company Event Date Document Period Start Date Document Period End Date Document Fiscal Period Focus Document Fiscal Year Focus Current Fiscal Year End Date Entity File Number Entity Registrant Name Entity Central Index Key Entity Primary SIC Number Entity Tax Identification Number Entity Incorporation, State or Country Code Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Three Entity Address, City or Town Entity Address, State or Province Entity Address, Country Entity Address, Postal Zip Code Country Region City Area Code Local Phone Number Extension Written Communications Soliciting Material Pre-commencement Tender Offer Pre-commencement Issuer Tender Offer Title of 12(b) Security No Trading Symbol Flag Trading Symbol Security Exchange Name Title of 12(g) Security Security Reporting Obligation Annual Information Form Audited Annual Financial Statements Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Small Business Entity Emerging Growth Company Elected Not To Use the Extended Transition Period Document Accounting Standard Other Reporting Standard Item Number Entity Shell Company Entity Public Float Entity Bankruptcy Proceedings, Reporting Current Entity Common Stock, Shares Outstanding Documents Incorporated by Reference [Text Block] Document Financial Statement Error Correction [Flag] Entity Listing, Par Value Per Share Cybersecurity Risk Management Processes Integrated [Text Block] Cybersecurity Risk Management Processes Integrated [Flag] Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag] Auditor Firm ID Auditor Opinion [Text Block] Auditor Name Auditor Location Statement of Financial Position [Abstract] ASSETS Current assets Cash and cash equivalents Prepayment and deposit Total current assets Non - current asset Plant and equipment, net Total non - current asset TOTAL ASSETS LIABILITIES AND STOCKHOLDERS’ EQUITY Current liabilities Accounts payable Other payable Advances from customers Amounts due to a related party Total current liabilities Total liabilities Commitments and contingencies Stockholders’ equity Common stock – Par value $ 0.0001; Authorized: 75,000,000 shares; Issued and outstanding: 22,400,000 and 20,000,000 shares as of March 31, 2026 and March 31, 2025 Additional paid in capital Accumulated deficit Total stockholders’ equity TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY Common stock, par value Common stock, shares authorized Common stock, shares issued Common stock, shares outstanding Income Statement [Abstract] Revenue Operating expenses General and administrative expenses Total operating expenses Loss from operations Net Loss Earnings per share Net loss per common share - basic Net loss per common share - diluted Weighted average number of common stock Basic Diluted Net Loss Other comprehensive (loss) income Foreign currency translation adjustments, net of tax of nil Comprehensive loss attributable to Yellowstone Group Ltd Total comprehensive loss attributable to common shares of Yellowstone Group Ltd Statement [Table] Statement [Line Items] Balance Balance, shares Net loss Issuance of share capital, founder’s shares Issuance of share capital, founder's shares Initial public offering Initial public offering, shares Balance Balance, shares Statement of Cash Flows [Abstract] Cash Flows From Operating Activities: Adjustments to reconcile net loss to net cash used in operating activities: Depreciation Changes in operating assets and liabilities: Prepayment Accounts payable Other payable Advances from customers Net cash provided by operating activities Cash Flows From Investing Activity: Purchase of plant and equipment Net cash used in investing activity Cash Flows From Financing Activity: Proceeds from issuance of shares Proceeds from related-party loans Net cash provided by financing activity Net change in cash and cash equivalents Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Supplemental cash flows information Income taxes paid Interest paid Pay vs Performance Disclosure [Table] Executive Category [Axis] Individual [Axis] Adjustment to Compensation [Axis] Measure [Axis] Pay vs Performance Disclosure, Table Company Selected Measure Name Named Executive Officers, Footnote Peer Group Issuers, Footnote Changed Peer Group, Footnote PEO Total Compensation Amount PEO Actually Paid Compensation Amount Adjustment To PEO Compensation, Footnote Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Compensation Actually Paid Amount Adjustment to Non-PEO NEO Compensation Footnote Equity Valuation Assumption Difference, Footnote Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Company Selected Measure Total Shareholder Return Vs Peer Group Compensation Actually Paid vs. Other Measure Tabular List, Table Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Net Income (Loss) Company Selected Measure Amount Other Performance Measure, Amount Adjustment to Compensation, Amount PEO Name Name Non-GAAP Measure Description Additional 402(v) Disclosure Pension Benefits Adjustments, Footnote Equity Awards Adjustments, Footnote Erroneously Awarded Compensation Recovery [Table] Restatement Determination Date [Axis] Restatement Determination Date Aggregate Erroneous Compensation Amount Erroneous Compensation Analysis Stock Price or TSR Estimation Method Outstanding Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Not Yet Determined Name Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery, Explanation of Impracticability Name Compensation Amount Restatement does not require Recovery Awards Close in Time to MNPI Disclosures [Table] Award Type [Axis] Award Timing MNPI Disclosure Award Timing Method Award Timing Predetermined Award Timing MNPI Considered Award Timing, How MNPI Considered MNPI Disclosure Timed for Compensation Value Awards Close in Time to MNPI Disclosures, Table Name Underlying Securities Exercise Price Fair Value as of Grant Date Underlying Security Market Price Change Insider Trading Arrangements [Line Items] Material Terms of Trading Arrangement Name Title Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted Adoption Date Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated Termination Date Expiration Date Arrangement Duration Aggregate Available No Insider Trading Flag Insider Trading Policies and Procedures [Line Items] Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Not Adopted Cybersecurity Risk Management, Strategy, and Governance [Abstract] Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block] Cybersecurity Risk Management Third Party Engaged [Flag] Cybersecurity Risk Third Party Oversight and Identification Processes [Flag] Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Text Block] Cybersecurity Risk Board of Directors Oversight [Text Block] 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] Cybersecurity Risk Role of Management [Text Block] Cybersecurity Risk Management Positions or Committees Responsible [Flag] Cybersecurity Risk Management Positions or Committees Responsible [Text Block] Cybersecurity Risk Management Expertise of Management Responsible [Text Block] Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block] Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag] Material Cybersecurity Incident [Abstract] Material Cybersecurity Incident Nature [Text Block] Material Cybersecurity Incident Scope [Text Block] Material Cybersecurity Incident Timing [Text Block] Material Cybersecurity Incident Material Impact or Reasonably Likely Material Impact [Text Block] Material Cybersecurity Incident Information Not Available or Undetermined [Text Block] Accounting Policies [Abstract] Organization and business background Summary of Significant Accounting Policies Cash and Cash Equivalents [Abstract] Cash and Cash Equivalents Property, Plant, and Equipment [Abstract] Property and equipment, net Related Party Transactions [Abstract] Related Party Transaction Equity [Abstract] Ordinary Shares Revenue from Contract with Customer [Abstract] Revenue Income Tax Disclosure [Abstract] Income Taxes Earnings Per Share [Abstract] Net Loss per Ordinary Share Risks and Uncertainties [Abstract] Concentrations of risk Commitments and Contingencies Disclosure [Abstract] Commitments and contingencies Segment Reporting [Abstract] Segment reporting Subsequent Events [Abstract] Subsequent Event Basis of presentation Use of estimates Cash and Cash Equivalents Accounts Receivable, net Plant and equipment, net Revenue Recognition Earnings Per Share Income Taxes Comprehensive Loss Related parties Fair Value Measurement Recently issued and adopted accounting pronouncements Schedule of Plant and Equipment Useful Live Summary of Cash and Cash Equivalents Schedule of Property and Equipment Schedule of Amount Due to Related Parties Schedule of Revenue from Contract with Customer Schedule of Loss from Operation Before Income Tax Schedule of Components of Deferred Tax Assets Schedule of Earnings Per Share Schedule of Concentration of Risk Schedule of Segment Reporting Information Property, Plant, and Equipment [Table] Property, Plant, and Equipment [Line Items] Property and Equipment Useful Life U.S. federal corporate income tax rate Total Furniture and fixtures Less: Accumulated depreciation Plant and equipment, net Depreciation expense Related Party Transaction [Table] Related Party Transaction [Line Items] Amount due to related parties Common stock shares authorized Common stock shares, subscribed Common stock , par value Common stock shares, subscription value Common stock shares sold Sale of stock, price per share Stock issued Proceeds from issuance of common stock Common stock shares, issued Common stock shares, outstanding Disaggregation of Revenue [Table] Disaggregation of Revenue [Line Items] Total Effective Income Tax Rate Reconciliation [Table] Effective Income Tax Rate Reconciliation [Line Items] Loss before income taxes – United States of America Less: valuation allowance Deferred tax assets Federal tax rate Net operating losses Deferred tax assets valuation allowance Net income - basic Net income - diluted Weighted average number of common shares outstanding Net income per share - basic Net income per share - diluted Concentration Risk [Table] Concentration Risk [Line Items] Percentage of concentration Account receivables, gross Customer concentration risk percentage Capital commitments Revenue Three Customers [Member] Customer A [Member] Customer B [Member] Customer A and B [Member] Customer C [Member] Customer A and B and C [Member] Related Parties [Policy Text Block] Schedule Of Property Plant and Equipment Useful Lives [Table Text Block] Computer and Software [Member] No insider trading flag. Two Customers [Member] Financial Consulting Services [Member] Assets, Current Assets, Noncurrent Assets Liabilities, Current Liabilities Equity, Attributable to Parent Liabilities and Equity General and Administrative Expense Operating Expenses Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive Income (Loss), Net of Tax, Attributable to Parent Shares, Outstanding Increase (Decrease) in Prepaid Expense Increase (Decrease) in Accounts Payable, Trade Increase (Decrease) in Other Accounts Payable Increase (Decrease) in Due from Related Parties, Current Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Payments to Acquire Property, Plant, and Equipment Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Forgone Recovery, Individual Name Outstanding Recovery, Individual Name Awards Close in Time to MNPI Disclosures, Individual Name Trading Arrangement, Individual Name Revenue from Contract with Customer [Text Block] Commitments and Contingencies Disclosure [Text Block] Cash and Cash Equivalents, Policy [Policy Text Block] Property, Plant, and Equipment [Policy Text Block] Income Tax, Policy [Policy Text Block] Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization Deferred Tax Assets, Net of Valuation Allowance