Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2021	Aug. 05, 2021
Document Type	10-Q
Document Transition Report	false
Document Period End Date	Jun. 30, 2021
Document Quarterly Report	true
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	75 Varick Street
Entity Address, Adress Line Two	9th Floor
Entity Address, City or Town	NY
Entity Address State Or Province	NY
Entity Address, Postal Zip Code	10013
City Area Code	212
Local Phone Number	675-0541
Title of 12(b) Security	Warrants
Trading Symbol	RSVRW
Security Exchange Name	NASDAQ
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
Entity Ex Transition Period	false
Entity Shell Company	true
Entity Common Stock, Shares Outstanding		64,069,253
Entity Central Index Key	0001824403
Current Fiscal Year End Date	--03-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Amendment Flag	false
Common Stock
Title of 12(b) Security	Common Stock
Trading Symbol	RSVR
Security Exchange Name	NASDAQ