Contingencies and Guaranty	3 Months Ended
Contingencies and Guaranty	Jun. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Contingencies and Guaranty	Contingencies and Guaranty Contingent Liabilities SDG&E Refund Obligations In February 2021, the Company entered into an agreement with San Diego Gas & Electric Company, a subsidiary of Sempra Energy (“SDG&E”) to sell 900 MHz Broadband Spectrum throughout SDG&E’s California service territory, including San Diego and Imperial Counties and portions of Orange County (the “SDG&E Agreement”), for a total payment of $50.0 million. 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. In September 2022, the Company delivered to SDG&E 1.4 x 1.4 cleared 900 MHz Broadband Spectrum and the associated broadband license related to Imperial County and received a milestone payment of $0.2 million. A gain or loss on the sale of spectrum will be recognized for each county once the Company delivers the cleared 900 MHz Broadband Spectrum and the associated broadband licenses to SDG&E in full. As the Company is required to refund payments it has received in the event of termination or non-delivery of the specific county’s 900 MHz Broadband Spectrum, it recorded the $20.2 million received from SDG&E as a contingent liability on the Company’s Consolidated Balance Sheets. As of June 30, 2023, the $20.2 million payments from SDG&E remain recorded as a short-term liability due to the expected timing of delivery. SDG&E Broadband License Delivery Delay Adjustment The Company has all necessary FCC approvals and is ready to transfer the San Diego County broadband license to SDG&E pending one final arrangement. The Company is anticipating a delivery delay adjustment between $0.8 million and $1.3 million dependent upon final closing date. This is an isolated event related specifically to the unique aspects of this complicated spectrum market including a complex system. Xcel Energy Guaranty In October 2022, the Company entered into an agreement with Xcel Energy Services Inc. (“Xcel Energy”) providing Xcel Energy dedicated long-term usage of the Company’s 900 MHz Broadband Spectrum for a term of 20 years throughout Xcel Energy’s service territory in eight states (the “Xcel Energy Agreement”). In connection with Xcel Energy Agreement, the Company entered into a guaranty agreement, under which the Company guaranteed the delivery of the relevant 900 MHz Broadband Spectrum and the associated broadband licenses in Xcel Energy’s service territory in eight states along with other commercial obligations. In the event of default or non-delivery of the specific territory’s 900 MHz Broadband Spectrum, the Company is required to refund payments it has received. In addition, to the extent Anterix has performed any obligations, the Company’s liability and remaining obligations under the Xcel Energy Agreement will extend only to the remaining unperformed obligations. The Company recorded $8.0 million in deferred revenue in connection with the prepayment received as the delivery of the relevant cleared 900 MHz Broadband Spectrum and the associated broadband licenses commenced in the first quarter of fiscal year 2024 and will continue through 2029. As of June 30, 2023, the maximum potential liability of future undiscounted payments under this agreement is approximately $8.0 million. Litigation From time to time, the Company may be involved in litigation that arises from the ordinary operations of the business, such as contractual or employment disputes or other general actions. The Company is not involved in any material legal proceedings at this time. Pandemic and Macroeconomic Conditions Recent macroeconomic events, including the outbreak of COVID-19, inflation, and geopolitical matters, have increased operating costs and could increase production costs or result in delays in customer contracting or the availability of equipment necessary for the deployment of our target customers’ planned PLTE projects. The Company continues to closely monitor these risks. Although difficult to quantify, the Company believes the current macroeconomic environment, including inflation, may have an adverse effect on the Company’s target customers’ businesses, which may harm the Company’s commercialization efforts and negatively impact the Company’s revenues and liquidity. If the Company is not able to control its higher operating costs or if the Company’s commercialization efforts are slowed or negatively impacted, continued periods of high inflation could have a material adverse effect on the Company’s business, operating results and financial condition.