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Document and Entity Information - shares
 6 Months Ended
Sep. 30, 2021
Oct. 28, 2021
Document And Entity Information [Abstract]    
Document Type 10-Q/A  
Document Quarterly Report true  
Document Fiscal Year Focus 2022  
Document Period End Date Sep. 30, 2021  
Current Fiscal Year End Date --03-31  
Document Transition Report false  
Entity File Number 001-36827  
Entity Registrant Name Anterix Inc.  
Entity Incorporation, State or Country Code DE  
Entity Address, Address Line One 3 Garret Mountain Plaza  
Entity Address, Address Line Two Suite 401  
Entity Address, City or Town Woodland Park  
Entity Address, State or Province NJ  
Entity Tax Identification Number 33-0745043  
Entity Address, Postal Zip Code 07424  
City Area Code 973  
Local Phone Number 771-0300  
Title of 12(b) Security Common Stock, $0.0001 par value  
Trading Symbol ATEX  
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 false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   18,366,428
Amendment Flag true  
Document Fiscal Period Focus Q2  
Entity Central Index Key 0001304492  
Amendment Description This Amendment No. 1 to Quarterly Report on Form 10-Q/A (this “Form 10-Q/A”) amends and restates certain items noted below in the Quarterly Report on Form 10-Q of Anterix, Inc. (the “Company”) for the quarter ended September 30, 2021, as originally filed with the Securities and Exchange Commission (the “SEC”) on November 3, 2021 (the “Original Filing”). This Form 10-Q/A amends the Original Filing to reflect the correction of an error in the previously reported financial statements related to the Company’s accounting treatment of the gain in the estimated accounting cost basis of its intangible assets resulting from the non-monetary exchange of its narrowband licenses for broadband licenses. Restatement As disclosed in the Current Report on Form 8-K dated February 3, 2022, in connection with the preparation of the Quarterly Report on Form 10-Q for the quarter ended December 31, 2021 (“Q3 FY 22 Quarterly Report”), the Company determined that it incorrectly excluded the gain in the value of its intangible assets following the non-monetary exchange of the Company’s narrowband licenses for broadband licenses in August 2021 upon approval of the exchange by the Federal Communications Commission. The Company should have recorded the newly received broadband licenses at their estimated accounting cost basis and recognized the difference between the estimated accounting cost basis of the broadband licenses obtained and the carrying value of the narrowband licenses relinquished as a gain on disposal of intangible assets. The Company has determined that its intangible assets should have increased by approximately $10.2 million as a result of this exchange, with a corresponding gain on disposal of the intangible assets. See Note 2 to the Consolidated Financial Statements included in Item 1 of this Form 10-Q/A for additional information and a reconciliation of the previously reported amounts to the restated amounts. Internal Control over Financial Reporting Management has reassessed its evaluation of the effectiveness of the design and operation of its disclosure controls and procedures as of September 30, 2021. As a result of this reassessment, management has concluded that the Company did not maintain effective controls and procedures due to a material weakness in the Company’s internal control over financial reporting that existed at that date. For a description of the material weakness in internal control over financial reporting and the remedial actions taken, and to be taken, to address and resolve the material weakness, see Part I, Item 4. “Controls and Procedures” of this Form 10-Q/A. Items Amended in this Filing For the convenience of the reader, this Form 10-Q/A sets forth the Original Filing, as amended, in its entirety; however, this Form 10- Q/A amends and restates the following Items of the Original Filing to the extent necessary to reflect the adjustments discussed above and to make corresponding revisions to the Company’s financial data cited elsewhere in this Form 10-Q/A: -Part I, Item 1 – Financial Statements-Part I, Item 2 – Management’s Discussion and Analysis of Financial Condition and Results of Operations-Part I, Item 4 – Controls and Procedures-Part II, Item 1a – Risk Factors-Part II, Item 6 – Exhibits In addition, the Company’s Chief Executive Officer and Chief Financial Officer have provided new certifications dated as of the date of this filing (Exhibits 31.1, 31.2, 32.1 and 32.2), and the Company has provided its restated consolidated financial statements formatted in Extensible Business Reporting Language (XBRL) in Exhibit 101. Except as described above, no other changes have been made to the Original Filing. This Form 10-Q/A speaks as of the date of the Original Filing and does not reflect events that may have occurred after the date of the Original Filing or modify or update any disclosures that may have been affected by subsequent events.