Document and Entity Information Document Information [Table] Class of Stock [Axis] Class of Stock [Domain] Common Stock [Member] Common Stock Represents publicly traded warrants to purchase one share of Class A common stock, each at an exercise price of $11.50 per share. Warrants to Purchase One Share of Class A Common Stock, Each At an Exercise Price of $11.50 Per Share [Member] Warrants to purchase one share of Common Stock, each at an exercise price of $11.50 per share Public Warrants Document Information [Line Items] Document and Entity Information Document Type Document Annual Report Document Period End Date Document Transition Report Entity File Number Entity Registrant Name Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Address, Address Line One Entity Address, Address Line Two Entity Address, City or Town Entity Address State Or Province Entity Address, Postal Zip Code City Area Code Local Phone Number Title of 12(b) Security Trading Symbol Security Exchange Name 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 ICFR Auditor Attestation Flag Document Financial Statement Error Correction [Flag] Entity Shell Company Entity Public Float Entity Common Stock, Shares Outstanding Documents Incorporated by Reference [Text Block] Auditor Firm ID Auditor Name Auditor Location Entity Central Index Key Current Fiscal Year End Date Document Fiscal Year Focus Document Fiscal Period Focus Amendment Flag CONSOLIDATED STATEMENTS OF INCOME Statement [Table] Statement [Line Items] Statement Revenue from Contract with Customer, Excluding Assessed Tax Revenues Costs and expenses: Costs and expenses: Cost of Revenue Cost of revenue Cost of revenue Depreciation, Depletion and Amortization, Nonproduction Amortization and depreciation Amortization and depreciation General and administrative expense Administration expenses Costs and Expenses Total costs and expenses Operating Income (Loss) Operating income Interest Expense, Nonoperating Interest expense Foreign Currency Transaction Gain (Loss), before Tax Gain on foreign exchange Derivative, Gain (Loss) on Derivative, Net Loss on fair value of swaps Loss on fair value of swaps Other Nonoperating Income (Expense) Other (expense) income, net Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income before income taxes Income Tax Expense (Benefit) Actual income tax provision Income tax expense Income tax expense Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net income Net income Net income (loss) Net Income (Loss) Attributable to Noncontrolling Interest Net loss attributable to noncontrolling interests Net income attributable to Reservoir Media, Inc. EARNINGS PER SHARE Earnings per common share (Note 13): Earnings Per Share, Basic Basic (in dollars per share) Earnings per common share - basic (in dollars per share) Earnings Per Share, Diluted Earnings per common share - diluted (in dollars per share) Diluted (in dollars per share) Weighted Average Number of Shares Outstanding, Diluted [Abstract] Weighted average common shares outstanding (Note 13): Weighted Average Number of Shares Outstanding, Basic Weighted average common shares outstanding - basic (in shares) Basic (in shares) Weighted Average Number of Shares Outstanding, Diluted Weighted average common shares outstanding - diluted (in shares) Diluted (in shares) CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Other comprehensive loss: Other comprehensive income: Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Translation adjustments Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Total comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive loss attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Parent Total comprehensive income attributable to Reservoir Media, Inc. CONSOLIDATED BALANCE SHEETS Assets [Abstract] Assets Current assets Current assets Cash held outside the Trust Account Cash and cash equivalents as presented in Consolidated Balance Sheets Cash and cash equivalents Accounts Receivable, after Allowance for Credit Loss, Current Accounts receivable Advance Royalties, Current Current portion of royalty advances Other Assets, Current Other current assets Assets, Current Total current assets Intangible Assets, Net (Excluding Goodwill) Intangible assets, net Intangible assets, net Equity method and other investments Equity method and other investments Advance Royalties, Noncurrent Royalty advances, net of current portion and reserves Property, Plant and Equipment, Net Property and equipment, net Operating Lease, Right-of-Use Asset Operating lease right of use assets, net Operating lease right-of-use assets Derivative Asset, Noncurrent Fair value of swap assets Other Assets, Noncurrent Other assets Assets Total assets Liabilities [Abstract] Liabilities Liabilities, Current [Abstract] Current liabilities Accounts Payable and Accrued Liabilities, Current Accounts payable and accrued liabilities Accrued Royalties, Current Royalties payable Accrued Salaries, Current Accrued payroll Contract with Customer, Liability, Current Balance at end of period Balance at beginning of period Deferred revenue Other Liabilities, Current Other current liabilities Accrued Income Taxes, Current Income taxes payable Liabilities, Current Total current liabilities Long-term Debt, Excluding Current Maturities Secured line of credit Long-term portion Deferred Income Tax Liabilities, Net Net deferred tax liabilities Deferred tax liability Operating Lease, Liability, Noncurrent Operating lease liabilities, net of current portion Noncurrent portion of operating lease liabilities Derivative Liability, Noncurrent Fair value of swap liability Other Liabilities, Noncurrent Total Other liabilities Liabilities Total liabilities Commitments and Contingencies Contingencies and commitments (Note 16) Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Shareholders' Equity Preferred Stock, Value, Issued Preferred stock, $0.0001 par value 75,000,000 shares authorized, 0 shares issued and outstanding at March 31, 2026 and 2025 Common Stock, Value, Issued Common stock, $0.0001 par value; 750,000,000 shares authorized, 65,602,509 issued and outstanding at March 31, 2026; 65,239,735 issued and outstanding at March 31, 2025 Additional Paid in Capital Additional paid-in capital Retained Earnings (Accumulated Deficit). Retained earnings Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive loss Stockholders' Equity Attributable to Parent Total Reservoir Media, Inc. shareholders' equity Stockholders' Equity Attributable to Noncontrolling Interest Noncontrolling interest Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Ending balance Beginning balance Total shareholders' equity Liabilities and Equity Total liabilities and shareholders' equity Preferred Stock, Par or Stated Value Per Share Preferred stock, par value (in dollars per share) Preferred Stock, Shares Authorized Preferred stock, shares authorized Preferred Stock, Shares Issued Preferred stock, shares issued Preferred Stock, Shares Outstanding Preferred stock, shares outstanding Common Stock, Par or Stated Value Per Share Common stock, par value (in dollars per share) Common Stock, Shares Authorized Common stock, shares authorized Common Stock, Shares, Issued Common stock, shares issued Common Stock, Shares, Outstanding Common stock, shares outstanding CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY Equity Components [Axis] Equity Component [Domain] Additional Paid-in Capital Additional paid-in capital Retained Earnings (Accumulated Deficit) [Member] Retained earnings Accumulated other comprehensive income (loss) [Member] Accumulated other comprehensive loss Noncontrolling Interests [Member] Noncontrolling interests Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity Shares, Outstanding Ending balance (in shares) Beginning balance (in shares) APIC, Share-based Payment Arrangement, Increase for Cost Recognition Share-based compensation Stock Issued During Period, Value, Stock Options Exercised Stock option exercises Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Exercised (in shares) Stock option exercises (in shares) Restricted Stock, Value, Shares Issued Net of Tax Withholdings Vesting of restricted stock units, net of shares withheld for employee taxes Restricted Stock, Shares Issued Net of Shares for Tax Withholdings Vesting of restricted stock units, net of shares withheld for employee taxes (in shares) Adjustments to Additional Paid in Capital, Other Reclassification of liability-classified awards to equity-classified awards Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Distribution to noncontrolling interest holders Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Acquisition of noncontrolling interests Other Comprehensive Income (Loss), Net of Tax Other comprehensive income CONSOLIDATED STATEMENTS OF CASH FLOWS Cash flows from operating activities Cash flows from operating activities: Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to reconcile net income to net cash provided by operating activities: Amortization of Intangible Assets Amortization expense Amortization of intangible assets Depreciation Depreciation of property and equipment Share-based Payment Arrangement, Noncash Expense Share-based compensation Amortization of Debt Issuance Costs Amortization of deferred financing costs Income (Loss) from Equity Method Investments Loss from equity method investments Equity Method Investment, Other than Temporary Impairment Impairment of equity investment Equity Method Investment, Realized Gain (Loss) on Disposal Gain on disposition of equity investment Gain on disposition of equity investment Deferred Income Tax Expense (Benefit) Total deferred Deferred income taxes Changes in operating assets and liabilities: Changes in operating assets and liabilities: Increase (Decrease) in Accounts Receivable Accounts receivable Increase (Decrease) in Other Current Assets Other current assets Increase (Decrease) in Prepaid Royalties Royalty advances Increase (Decrease) in Other Operating Assets and Liabilities, Net Other assets and liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Accounts payable, accrued expenses and deferred revenue Increase (Decrease) in Royalties Payable Royalties payable Increase (Decrease) in Income Taxes Payable Income taxes payable Net Cash Provided by (Used in) Operating Activities Net cash provided by operating activities Cash flows from investing activities: Cash flows from investing activities: Payments to Acquire Intangible Assets Purchases of music catalogs Payments to Acquire Notes Receivable Loan to third party Proceeds from Sale and Collection of Receivables Repayment of loan from third party Payments to Acquire Equity Method Investments Investments in equity affiliates Proceeds from Sale of Equity Method Investments Sale of equity investment Payments to Acquire Property, Plant, and Equipment Purchases of property and equipment Net Cash Provided by (Used in) Investing Activities Net cash used for investing activities Cash flows from financing activities: Cash flows from financing activities: Proceeds from Lines of Credit Proceeds from secured line of credit Repayments of Lines of Credit Repayments of secured line of credit Proceeds from Stock Options Exercised Proceeds from stock option exercises Payment, Tax Withholding, Share-Based Payment Arrangement Taxes paid related to net share settlement of restricted stock units Payments of Financing Costs Deferred financing costs paid Payments for Repurchase of Redeemable Noncontrolling Interest Acquisition of noncontrolling interests Payments to Noncontrolling Interests Distribution to noncontrolling interest holders Net Cash Provided by (Used in) Financing Activities Net cash provided by financing activities Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Foreign exchange impact on cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Net increase in cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, cash equivalents and restricted cash at end of year Cash, cash equivalents and restricted cash at beginning of year Cash, cash equivalents and restricted cash as presented in Consolidated Statements of Cash Flows Restricted Cash, Current Restricted cash included in Other current assets Restricted Cash, Current, Statement of Financial Position [Extensible Enumeration] DESCRIPTION OF BUSINESS Business Description and Basis of Presentation [Text Block] DESCRIPTION OF BUSINESS SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES REVENUE RECOGNITION Revenue from Contract with Customer [Text Block] REVENUE RECOGNITION ACQUISITIONS Asset Acquisition Text Block ACQUISITIONS INTANGIBLE ASSETS Intangible Assets Disclosure [Text Block] INTANGIBLE ASSETS