Nature of Operations	6 Months Ended
Sep. 30, 2021
Nature of Operations [Abstract]
Nature of Operations	1. Nature of Operations Anterix Inc. (the “Company”) is a wireless communications company focused on commercializing its spectrum assets to enable its targeted utility and critical infrastructure customers to deploy private broadband networks, technologies and solutions. The Company is the largest holder of licensed spectrum in the 900 MHz band (896-901/935-940 MHz) with nationwide coverage throughout the contiguous United States, Hawaii, Alaska and Puerto Rico. On May 13, 2020, the Federal Communications Commission (“FCC”) approved the Report and Order to modernize and realign the 900 MHz band to increase its usability and capacity by allowing it to be utilized for the deployment of broadband networks, technologies and solutions (the “Report and Order”). The Report and Order was published in the Federal Register on July 16, 2020 and became effective on August 17, 2020. The Company is now engaged in qualifying for and securing broadband licenses from the FCC. At the same time, the Company is pursuing opportunities to lease the spectrum for which broadband licenses are secured to its targeted utility and critical infrastructure customers. The Company was originally incorporated in California in 1997 and reincorporated in Delaware in 2014. In November 2015, the Company changed its name from Pacific DataVision, Inc. to pdvWireless, Inc. In August 2019, the Company changed its name from pdvWireless, Inc. to Anterix Inc. The Company maintains offices in Woodland Park, New Jersey and McLean, Virginia. In December 2020, the Company entered into its first long-term lease agreement of 900 MHz spectrum authorized for broadband use (“900 MHz Broadband Spectrum”), with Ameren Corporation (“Ameren”), (“Ameren Agreements”). The Ameren Agreements will enable Ameren to deploy a private LTE network in its service territories in Missouri and Illinois, covering approximately 7.5 million people. Each Ameren Agreement is for a term of up to 40 years, consisting of an initial term of 30 years, with a 10-year renewal option for an additional payment. The scheduled prepayments for the 30-year initial terms of the Ameren Agreements total $47.7 million, of which $0.3 million was received by the Company in February 2021, $5.4 million in September 2021 and $17.2 million in October 2021. The prepayments received to date encompass the initial upfront payment(s) due upon signing of the Ameren Agreements and payments for delivery of the relevant 1.4 x 1.4 cleared spectrum in several metropolitan counties throughout Missouri and Illinois, in accordance with the terms of the Ameren Agreements. The remaining prepayments for the 30-year initial term are due by mid-2026, per the terms of the Ameren Agreements and as the Company delivers the relevant cleared 900 MHz Broadband Spectrum and the associated broadband licenses. The Company is working with incumbents to clear the 900 MHz Broadband Spectrum allocation in Ameren’s service territory. In August 2021, the FCC granted the first 900 MHz broadband licenses to the Company for several counties in Ameren’s service territory, for which the Ameren Agreements were also subsequently approved by the FCC. The Company expects to recognize revenue from the Ameren Agreements commencing in the second half of fiscal year 2022. Revenue will be recognized as cleared 900 MHz Broadband Spectrum and the associated broadband licenses are delivered based on straight-line amortization over the initial 30-year terms of the Ameren Agreements. The Company’s board of directors (the “Board”) approved the Ameren Agreements on April 23, 2021, and Ameren’s board of directors approved the Ameren Agreements on May 6, 2021. In February 2021, the Company entered into an agreement with SDG&E (the “SDG&E Agreement”), to provide 900 MHz Broadband Spectrum throughout SDG&E’s California service territory, including San Diego and Imperial Counties and portions of Orange County for a total payment of $50.0 million. The SDG&E Agreement will support SDG&E’s deployment of a private LTE network for its California service territory, with a population of approximately 3.6 million people. As part of the SDG&E Agreement, the Company and SDG&E are collaborating to accelerate the utility industry momentum for private networks. The SDG&E Agreement includes the assignment of 6 MHz of 900 MHz Broadband Spectrum, 936.5 – 939.5 MHz paired with 897.5 – 900.5 MHz, within SDG&E’s service territory following the FCC’s issuance of the broadband licenses to the Company. Delivery of the relevant 900 MHz Broadband Spectrum and the associated broadband licenses by county is expected to commence in fiscal year 2023 and is scheduled for completion before the end of fiscal year 2024. The total payment of $50.0 million is comprised of an initial payment of $20.0 million received in February 2021 and the remaining $30.0 million payment, which is due through fiscal year 2024 as the Company delivers the relevant cleared 900 MHz Broadband Spectrum and the associated broadband licenses to SDG&E. The Company is working with incumbents to clear the 900 MHz Broadband Spectrum allocation in the SDG&E’s California service territory. The SDG&E Agreement is subject to customary provisions regarding remedies, including reduced payment amounts and/or refund of amounts paid, and termination rights, if a party fails to perform its contractual obligations. Both SDG&E and Anterix obtained all necessary internal approvals prior to executing the SDG&E Agreement. A gain or loss will be recognized in each county once the cleared 900 MHz Broadband Spectrum and the associated broadband licenses are delivered to SDG&E. In September 2021, the Company entered into a long-term lease agreement of 900 MHz Broadband Spectrum with Evergy Services, Inc. (“Evergy”), (“Evergy Agreement”). The Evergy service territories covered by the Evergy Agreement are in Kansas and Missouri with a population of approximately 3.9 million people. The Evergy Agreement is for a term of up to 40 years, comprised of an initial term of 20 years with two 10-year renewal options for additional payments. Prepayment in full of the $30.2 million for the 20-year initial term, which was due and payable within thirty (30) days after execution of the Evergy Agreement, was received by the Company in October 2021. The Evergy Agreement is subject to customary provisions regarding remedies for non-delivery, including refund of amounts paid and termination rights, if Anterix fails to perform its contractual obligations, including failure to deliver the relevant cleared 900 MHz Broadband Spectrum, in accordance with the terms of the Evergy Agreement. The Company is working with incumbents to clear the 900 MHz Broadband Spectrum allocation covered by the Evergy Agreement. Evergy and Anterix obtained all necessary internal approvals prior to executing the Evergy Agreement. The Company expects to recognize revenue from the Evergy Agreement commencing in the second half of fiscal year 2022. Revenue will be recognized as the relevant 900 MHz Broadband Spectrum is delivered based on straight-line amortization over the initial 20-year term of the Evergy Agreement.

Nature of Operations

6 Months Ended

Sep. 30, 2021

1. Nature of Operations Anterix Inc. (the “Company”) is a wireless communications company focused on commercializing its spectrum assets to enable its targeted utility and critical infrastructure customers to deploy private broadband networks, technologies and solutions. The Company is the largest holder of licensed spectrum in the 900 MHz band (896-901/935-940 MHz) with nationwide coverage throughout the contiguous United States, Hawaii, Alaska and Puerto Rico. On May 13, 2020, the Federal Communications Commission (“FCC”) approved the Report and Order to modernize and realign the 900 MHz band to increase its usability and capacity by allowing it to be utilized for the deployment of broadband networks, technologies and solutions (the “Report and Order”). The Report and Order was published in the Federal Register on July 16, 2020 and became effective on August 17, 2020. The Company is now engaged in qualifying for and securing broadband licenses from the FCC. At the same time, the Company is pursuing opportunities to lease the spectrum for which broadband licenses are secured to its targeted utility and critical infrastructure customers. The Company was originally incorporated in California in 1997 and reincorporated in Delaware in 2014. In November 2015, the Company changed its name from Pacific DataVision, Inc. to pdvWireless, Inc. In August 2019, the Company changed its name from pdvWireless, Inc. to Anterix Inc. The Company maintains offices in Woodland Park, New Jersey and McLean, Virginia. In December 2020, the Company entered into its first long-term lease agreement of 900 MHz spectrum authorized for broadband use (“900 MHz Broadband Spectrum”), with Ameren Corporation (“Ameren”), (“Ameren Agreements”). The Ameren Agreements will enable Ameren to deploy a private LTE network in its service territories in Missouri and Illinois, covering approximately 7.5 million people. Each Ameren Agreement is for a term of up to 40 years, consisting of an initial term of 30 years, with a 10-year renewal option for an additional payment. The scheduled prepayments for the 30-year initial terms of the Ameren Agreements total $47.7 million, of which $0.3 million was received by the Company in February 2021, $5.4 million in September 2021 and $17.2 million in October 2021. The prepayments received to date encompass the initial upfront payment(s) due upon signing of the Ameren Agreements and payments for delivery of the relevant 1.4 x 1.4 cleared spectrum in several metropolitan counties throughout Missouri and Illinois, in accordance with the terms of the Ameren Agreements. The remaining prepayments for the 30-year initial term are due by mid-2026, per the terms of the Ameren Agreements and as the Company delivers the relevant cleared 900 MHz Broadband Spectrum and the associated broadband licenses. The Company is working with incumbents to clear the 900 MHz Broadband Spectrum allocation in Ameren’s service territory. In August 2021, the FCC granted the first 900 MHz broadband licenses to the Company for several counties in Ameren’s service territory, for which the Ameren Agreements were also subsequently approved by the FCC. The Company expects to recognize revenue from the Ameren Agreements commencing in the second half of fiscal year 2022. Revenue will be recognized as cleared 900 MHz Broadband Spectrum and the associated broadband licenses are delivered based on straight-line amortization over the initial 30-year terms of the Ameren Agreements. The Company’s board of directors (the “Board”) approved the Ameren Agreements on April 23, 2021, and Ameren’s board of directors approved the Ameren Agreements on May 6, 2021. In February 2021, the Company entered into an agreement with SDG&E (the “SDG&E Agreement”), to provide 900 MHz Broadband Spectrum throughout SDG&E’s California service territory, including San Diego and Imperial Counties and portions of Orange County for a total payment of $50.0 million. The SDG&E Agreement will support SDG&E’s deployment of a private LTE network for its California service territory, with a population of approximately 3.6 million people. As part of the SDG&E Agreement, the Company and SDG&E are collaborating to accelerate the utility industry momentum for private networks. The SDG&E Agreement includes the assignment of 6 MHz of 900 MHz Broadband Spectrum, 936.5 – 939.5 MHz paired with 897.5 – 900.5 MHz, within SDG&E’s service territory following the FCC’s issuance of the broadband licenses to the Company. Delivery of the relevant 900 MHz Broadband Spectrum and the associated broadband licenses by county is expected to commence in fiscal year 2023 and is scheduled for completion before the end of fiscal year 2024. The total payment of $50.0 million is comprised of an initial payment of $20.0 million received in February 2021 and the remaining $30.0 million payment, which is due through fiscal year 2024 as the Company delivers the relevant cleared 900 MHz Broadband Spectrum and the associated broadband licenses to SDG&E. The Company is working with incumbents to clear the 900 MHz Broadband Spectrum allocation in the SDG&E’s California service territory. The SDG&E Agreement is subject to customary provisions regarding remedies, including reduced payment amounts and/or refund of amounts paid, and termination rights, if a party fails to perform its contractual obligations. Both SDG&E and Anterix obtained all necessary internal approvals prior to executing the SDG&E Agreement. A gain or loss will be recognized in each county once the cleared 900 MHz Broadband Spectrum and the associated broadband licenses are delivered to SDG&E. In September 2021, the Company entered into a long-term lease agreement of 900 MHz Broadband Spectrum with Evergy Services, Inc. (“Evergy”), (“Evergy Agreement”). The Evergy service territories covered by the Evergy Agreement are in Kansas and Missouri with a population of approximately 3.9 million people. The Evergy Agreement is for a term of up to 40 years, comprised of an initial term of 20 years with two 10-year renewal options for additional payments. Prepayment in full of the $30.2 million for the 20-year initial term, which was due and payable within thirty (30) days after execution of the Evergy Agreement, was received by the Company in October 2021. The Evergy Agreement is subject to customary provisions regarding remedies for non-delivery, including refund of amounts paid and termination rights, if Anterix fails to perform its contractual obligations, including failure to deliver the relevant cleared 900 MHz Broadband Spectrum, in accordance with the terms of the Evergy Agreement. The Company is working with incumbents to clear the 900 MHz Broadband Spectrum allocation covered by the Evergy Agreement. Evergy and Anterix obtained all necessary internal approvals prior to executing the Evergy Agreement. The Company expects to recognize revenue from the Evergy Agreement commencing in the second half of fiscal year 2022. Revenue will be recognized as the relevant 900 MHz Broadband Spectrum is delivered based on straight-line amortization over the initial 20-year term of the Evergy Agreement.