v3.26.1
Document and Entity Information - USD ($)
 12 Months Ended
Mar. 31, 2026
May 19, 2026
Sep. 30, 2025
Document and Entity Information      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Mar. 31, 2026    
Document Transition Report false    
Entity File Number 001-39795    
Entity Registrant Name RESERVOIR MEDIA, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 83-3584204    
Entity Address, Address Line One 200 Varick Street    
Entity Address, Address Line Two Suite 801    
Entity Address, City or Town NY    
Entity Address State Or Province NY    
Entity Address, Postal Zip Code 10014    
City Area Code 212    
Local Phone Number 675-0541    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 167,090,553
Entity Common Stock, Shares Outstanding   65,661,714  
Documents Incorporated by Reference [Text Block]

The information required by Part III of this Annual Report on Form 10-K, to the extent not set forth herein, is incorporated by reference to the registrant’s definitive proxy statement relating to the 2026 Annual Meeting of Stockholders, which will be filed with the Securities and Exchange Commission within 120 days after the end of the fiscal year to which this Annual Report on Form 10-K relates.

    
Auditor Firm ID 34    
Auditor Name Deloitte & Touche LLP    
Auditor Location New York, New York    
Entity Central Index Key 0001824403    
Current Fiscal Year End Date --03-31    
Document Fiscal Year Focus 2026    
Document Fiscal Period Focus FY    
Amendment Flag false    
Common Stock      
Document and Entity Information      
Title of 12(b) Security Common Stock, $0.0001 par value per share (the “Common Stock”)    
Trading Symbol RSVR    
Security Exchange Name NASDAQ    
Warrants to purchase one share of Common Stock, each at an exercise price of $11.50 per share      
Document and Entity Information      
Title of 12(b) Security Warrants to purchase one share of CommonStock, each at an exercise price of $11.50 per share    
Trading Symbol RSVRW    
Security Exchange Name NASDAQ