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Cover
Apr. 19, 2024
Cover [Abstract]  
Document Type 8-K
Document Period End Date Apr. 19, 2024
Entity Registrant Name Anterix Inc.
Entity Incorporation, State or Country Code DE
Entity File Number 001-36827
Entity Tax Identification Number 33-0745043
Entity Address, Address Line Two Suite 401
Entity Address, City or Town Woodland Park
Entity Address, State or Province NJ
Entity Address, Postal Zip Code 07424
City Area Code 973
Local Phone Number 771-0300
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, $0.0001 par value
Trading Symbol ATEX
Entity Emerging Growth Company false
Amendment Flag false
Entity Central Index Key 0001304492
Entity Address, Address Line One 3 Garret Mountain Plaza
Security Exchange Name NASDAQ