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Cover
Jun. 28, 2024
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Jun. 28, 2024
Entity File Number 811-08476
Entity Registrant Name THE GABELLI MULTIMEDIA TRUST INC.
Entity Central Index Key 0000921671
Entity Tax Identification Number 13-3767317
Entity Incorporation, State or Country Code MD
Entity Address, Address Line One One Corporate Center
Entity Address, City or Town Rye
Entity Address, State or Province NY
Entity Address, Postal Zip Code 10580
City Area Code 800
Local Phone Number 422-3554
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Shares of Beneficial Interest
Trading Symbol GGT
Security Exchange Name NYSE
Entity Emerging Growth Company false