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Document and Entity Information
Aug. 10, 2022
Cover [Abstract]  
Amendment Flag false
Entity Central Index Key 0001304492
Document Type 8-K
Document Period End Date Aug. 10, 2022
Entity Registrant Name Anterix Inc.
Entity Incorporation State Country Code DE
Entity File Number 001-36827
Entity Tax Identification Number 33-0745043
Entity Address, Address Line One 3 Garret Mountain
Entity Address, Address Line Two Plaza
Entity Address, Address Line Three 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
Security 12b Title Common Stock, $0.0001 par value
Trading Symbol ATEX
Security Exchange Name NASDAQ
Entity Emerging Growth Company false