Equity Components [Axis] Preferred Stock [Member] Common Stock [Member] Additional Paid-in Capital [Member] Retained Earnings [Member] Investment, Name [Axis] Round Top Mountain Development Company LLC [Member] Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Merger Agreement [Member] Legal Entity [Axis] USA Rare Earth Inc. [Member] Counterparty Name [Axis] Ownership [Axis] Round Top Mountain Development Company [Member] Texas General Land Office [Member] Long-Lived Asset, Class [Axis] August 2010 Lease [Member] November 2011 Lease [Member] Rio Grande Foundation [Member] March 2013 Lease [Member] October 2014 Surface Option And Water Lease [Member] Santa Fe Joint Venture [Member] Santa Fe Gold Corporation [Member] Title and Position [Axis] Chief Executive Officer [Member] Carlisle Millsite [Member] Homestead Lode [Member] Columbia Lode [Member] Carlisle Lode [Member] September 2, 2025 - 2029 [Member] November 1, 2025 - 2029 [Member] Debt Instrument [Axis] Unsecured Notes [Member] Director [Member] Award Type [Axis] Share-Based Payment Arrangement [Member] Share-Based Payment Arrangement, Option [Member] Redemption-exchange Agreement [Member] Class of Stock [Axis] USAR Common Stock [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] Statement of Financial Position [Abstract] ASSETS CURRENT ASSETS Cash and cash equivalents Prepaid expenses and other current assets Total current assets Restricted investment Mineral properties, net TOTAL ASSETS LIABILITIES AND SHAREHOLDERS' EQUITY CURRENT LIABILITIES Accounts payable and accrued liabilities Notes payable, related party Total current liabilities and liabilities COMMITMENTS AND CONTINGENCIES SHAREHOLDERS' EQUITY Preferred stock, par value $0.001; 10,000,000 shares authorized, no shares issued and oustanding as of May 31, 2026 and August 31, 2025 Common stock, par value $0.01; 100,000,000 shares authorized, 88,339,693 and 78,855,273 shares issued and oustanding as of May 31, 2026 and August 31, 2025, respectively Additional paid-in capital Accumulated deficit Total shareholders' equity TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY Preferred stock, par or stated value per share Preferred stock, shares authorized Preferred stock, shares issued Preferred stock, shares outstanding Common stock, par or stated value per share Common stock, shares authorized Common stock, shares issued Common stock, shares outstanding Income Statement [Abstract] OPERATING EXPENSES Exploration costs General and administrative expenses Total operating expenses LOSS FROM OPERATIONS OTHER INCOME (EXPENSE) Interest expense Change in value of equity securities Other income Total other income (expense) NET LOSS Net loss per share: Basic Diluted Weighted average shares outstanding: Basic Diluted Statement of Cash Flows [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES Net loss Adjustments to reconcile net loss to net cash used Stock based compensation Accretion of debt discount Change in value of equity securities Changes in current assets and liabilities: Prepaid expenses and other current assets Accounts payable and accrued liabilities Net cash used in operating activities CASH FLOWS FROM INVESTING ACTIVITIES Proceeds from sale of equity securities Purchases of restricted investment Net cash (provided by) used in investing activities CASH FLOWS FROM FINANCING ACTIVITIES Proceeds from exercise of stock options and warrants Proceeds from convertible notes and detachable warrants Net cash provided by financing activities NET CHANGE IN CASH AND CASH EQUIVALENTS CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD CASH AND CASH EQUIVALENTS, END OF PERIOD SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION Interest paid Taxes paid NON-CASH INVESTING AND FINANCING ACTIVITIES Mineral properties acquired under notes payable, related party Issuance of detachable warrants and discount on convertible notes Contribution of marketable equity securities Statement [Table] Statement [Line Items] Beginning balance, value Beginning balance (in shares) Stock based compensation Stock based compensation (in shares) Common stock issued upon cashless exercise of options Common stock issued upon cashless exercise of options (in shares) Common stock issued upon cashless exercise of options and warrants (in shares) Common stock issued upon cashless exercise of options and warrants Contribution of marketable equity securities Common stock issued as payment of accrued director's fees (in shares) Common stock issued as payment of accrued director's fees Common stock issued for services Common stock issued for services (in shares) Issuance of detachable warrants Common stock and stock options issued for services Common stock and stock options issued for services (in shares) Ending balance, value Ending balance (in shares) Organization, Consolidation and Presentation of Financial Statements [Abstract] GENERAL Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] MERGER AGREEMENT Equity Method Investments and Joint Ventures [Abstract] JOINT VENTURE ARRANGEMENTS Extractive Industries [Abstract] MINERAL PROPERTIES Environmental Remediation Obligations [Abstract] RECLAMATION Equity [Abstract] SHAREHOLDERS’ EQUITY Related Party Transactions [Abstract] RELATED PARTIES Schedule of August 2010 Lease Schedule of November 2011 Lease Equity Method Investment [Table] Schedule of Equity Method Investments [Line Items] Working capital surplus Ownership interest Collaborative Arrangement and Arrangement Other than Collaborative [Table] Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] Number of shares issued Notes Payable Termination fee Property, Plant, and Equipment [Table] Property, Plant, and Equipment [Line Items] Controlling ownership interest Mining lease - acres Mineral lease term Lease Bonus Payment of lease bonus Lease bonus due Minimum advance royalty due Production royalty of market value of uranium and fissionable materials Production royalty of market value of other minerals Lease extension period Payment of delay rental Cash Shares issued for lease Value of shares issued for lease Periodic payment for conservation efforts Payment period for conservation efforts Surface rights - acres Periodic option annual payment due Ground water lease - acres Distance from project mine Annual minimum production payment Production payment, amount per gallon Production payment, annual amount Ownership interest Area of property covered under agreement Percentage of known mining district covered Area of interest radius Exercise period of option Notes Payable, Related Party [Extensible Enumeration] Payment to acquire mining assets Mine and related real estate - acres Per Acre Amount Total amount Total Amount Outstanding letters of credit Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Line Items] Debt principal amount Shares issued upon conversion of notes Warrants number of shares Warrants exercised Warrants exercise price Cash consideration Issuance of shares Number of shares issued Stock options exercised Stock options exercise price Compensation expense Related Party Transaction [Table] Related Party Transaction [Line Items] Shares assigned to Company Marketable equity securities Number of shares sold Number of shares sold, value The element represents mining lease acres. The element represents lease bonus. The element represents payment of lease bonus. The element represents lease bonus due. The element represents minimum advance royalty due. The element represents production royalty of market value of uranium and fissionable materials. The element represents lease extension period. Tabular disclosure of the August 2010 lease. The element represents payment of delay rental. The element represents cash paid for lease assignment. The element represents periodic payment for conservation efforts. The element represents surface rights acres. The element represents periodic option annual payment due. The element represents ground water lease acres. The element represents distance from project mine. The element represents annual minimum production payment. The element represents lease production payment annual amount. The element represents area of property covered under agreement. The element represents percentage of known mining district covered. The element represents payment period for conservation efforts. Santa Fe Gold Corporation. The element represents exercise period of option. The element represents total lease amount for mineral properties. Tabular disclosure of the November 2011 lease. September 2, 2025 - 2029. November 1, 2025 - 2029. USA Rare Earth Inc. Round Top Mountain Development Company. Texas General Land Office. November 2011 Lease. Rio Grande Foundation. March 2013 Lease. October 2014 Surface Option And Water Lease. Santa Fe Joint Venture. Amount of working capital. Round Top Mountain Development Company LLC. August 2010 Lease. Lease amount, per acre for mineral properties. The element represents production payment amount per gallon. Area of mine and related real estate. Carlisle Millsite. Homestead Lode. Columbia Lode. Carlisle Lode. Unsecured Notes. The element represents production royalty of market value of other minerals. Primary term of mineral lease. Value of stock issued as a result of the exercise of warrants. Number of warrants exercised during the current period. The element represents area of interest radius. Non-cash amount of issuance of detachable warrants and discount on convertible notes. Redemption-exchange Agreement. USAR Common Stock. Common stock issued as payment of accrued director's fees. Common stock issued as payment of accrued director's fees, shares. Merger Agreement. Common stock and stock options issued for services. Number of common stock and stock options issued for services. Assets, Current Assets Liabilities, Current Equity, Attributable to Parent Liabilities and Equity Operating Expenses Operating Income (Loss) Interest Expense, Nonoperating Nonoperating Income (Expense) Weighted Average Number of Shares Outstanding, Basic Weighted Average Number of Shares Outstanding, Diluted Increase (Decrease) in Prepaid Expense and Other Assets Increase (Decrease) in Accounts Payable and Accrued Liabilities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Payments to Acquire Restricted Investments 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, Continuing Operation Shares, Outstanding Shares Granted, Value, Share-Based Payment Arrangement, before Forfeiture Adjustments to Additional Paid in Capital, Other Subsidiary, Ownership Percentage, Noncontrolling Owner Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period