v3.26.1
Cover - USD ($)
 12 Months Ended
Mar. 31, 2026
Sep. 30, 2025
Cover [Abstract]    
Document Type 10-K  
Amendment Flag false  
Document Annual Report true  
Document Transition Report false  
Document Period End Date Mar. 31, 2026  
Document Fiscal Period Focus FY  
Document Fiscal Year Focus 2026  
Current Fiscal Year End Date --03-31  
Entity File Number 333-259112  
Entity Registrant Name YELLOWSTONE GROUP LTD  
Entity Central Index Key 0002071489  
Entity Tax Identification Number 99-3878528  
Entity Incorporation, State or Country Code NV  
Entity Address, Address Line One 48 Janice Street  
Entity Address, Address Line Two Seven Hills  
Entity Address, City or Town Sydney  
Entity Address, Country AU  
Entity Address, Postal Zip Code 2147  
City Area Code (+61)  
Local Phone Number 450315883  
Entity Well-known Seasoned Issuer No  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Elected Not To Use the Extended Transition Period false  
Entity Shell Company false  
Entity Public Float   $ 0
Entity Common Stock, Shares Outstanding 22,400,000  
Document Financial Statement Error Correction [Flag] false  
Entity Listing, Par Value Per Share $ 0.0001  
Cybersecurity Risk Management Processes Integrated [Text Block] We have strategically integrated cybersecurity risk management into our broader risk management framework to promote a company-wide culture of cybersecurity risk management. This integration ensures that cybersecurity considerations are an integral part of our decision-making processes at every level.  
Cybersecurity Risk Management Processes Integrated [Flag] true  
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag] false  
Auditor Firm ID 7238  
Auditor Opinion [Text Block] We have audited the accompanying balance sheets of Yellowstone Group Ltd (the “Company”) as of March 31, 2026, and the related statement of operations, of comprehensive loss, of changes in shareholders’ deficit, and statement of cash flows for the year ended March 31, 2026, including the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of March 31, 2026, and the results of its operations and its cash flows for the period ended March 31, 2026, in conformity with accounting principles generally accepted in the United States of America.  
Auditor Name ELITECPA P.C.  
Auditor Location Piscataway, New Jersey