Commitments and Contingencies	6 Months Ended
Sep. 30, 2025
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 8 — Commitments and Contingencies From time to time, the Company enters into satellite construction agreements as well as various other satellite-related purchase commitments, including with respect to the provision of launch services, operation of its satellites and satellite insurance. See Note 14 — Commitments to the consolidated financial statements included in the Company’s Annual Report on Form 10-K for the year ended March 31, 2025 for information regarding the Company’s future minimum payments under its satellite construction contracts and other satellite-related purchase commitments. Periodically, the Company is involved in a variety of claims, suits, investigations and proceedings arising in the ordinary course of business, including government investigations and claims, and other claims and proceedings with respect to intellectual property, breach of contract, labor and employment, tax and other matters. Such matters could result in fines; penalties, compensatory, treble or other damages; or non-monetary relief. A violation of government contract laws and regulations could also result in the termination of its government contracts or debarment from bidding on future government contracts. Although claims, suits, investigations and proceedings are inherently uncertain and their results cannot be predicted with certainty, the Company believes that the resolution of its current pending matters will not have a material adverse effect on its business, financial condition, results of operations or liquidity. The Company has contracts with various U.S. Government agencies. Accordingly, the Company is routinely subject to audit and review by the DCMA, the DCAA and other U.S. Government agencies of its performance on government contracts, indirect rates and pricing practices, accounting and management internal control business systems, and compliance with applicable contracting and procurement laws, regulations and standards. An adverse outcome to a review or audit or other failure to comply with applicable contracting and procurement laws, regulations and standards could result in material civil and criminal penalties and administrative sanctions being imposed on the Company, which may include termination of contracts, forfeiture of profits, triggering of price reduction clauses, suspension of payments, significant customer refunds, fines and suspension, or a prohibition on doing business with U.S. Government agencies. In addition, if the Company fails to obtain an “adequate” determination of its various accounting and management internal control business systems from applicable U.S. Government agencies or if allegations of impropriety are made against it, the Company could suffer serious harm to its business or its reputation, including its ability to bid on new contracts or receive contract renewals and its competitive position in the bidding process. As of September 30, 2025, the DCMA had approved the Company’s incurred costs through fiscal year 2022. The DCAA is currently auditing the Company's fiscal year 2024 recurring incurred cost submission. The Company's cost accounting practices are examined for compliance with the applicable CAS. Although the Company has recorded contract revenues subsequent to fiscal year 2022 based upon an estimate of costs that the Company believes will be approved upon final audit or review, the Company does not know the outcome of any ongoing or future audits or reviews and adjustments and if future adjustments exceed the Company’s estimates, its profitability would be adversely affected. The Company had $15.1 million and $14.8 million as of September 30, 2025 and March 31, 2025, respectively, in contract-related reserves for its estimate of potential refunds to customers for potential cost adjustments on several multi-year U.S. Government cost reimbursable contracts. This reserve is classified as either an element of accrued liabilities or as a reduction of unbilled accounts receivable based on the status of the related contracts. In June 2025, Inmarsat agreed to a binding term sheet with Ligado Networks (Ligado) and AST & Science, LLC to settle Inmarsat's opposition to Ligado’s planned restructuring. Under the conditions set forth in the term sheet, the Company anticipates receiving $568 million from Ligado in fiscal year 2026, consisting of (i) a $420 million lump sum payment on October 31, 2025, (ii) a $100 million lump sum payment on March 31, 2026 and (iii) a resumption of quarterly payments of approximately $16 million, which started on September 30, 2025, with an annual escalator of 3% for the life of the contract (through 2107). On September 30, 2025, the Company received a $16.0 million quarterly payment and, subsequent to the second quarter of fiscal year 2026, based on the expiration of certain conditions, the Company received the lump sum payment of $420.0 million from Ligado. In September 2023, the Company settled certain pending litigation. Under the terms of the settlement and licensing agreement, the Company receives certain payments, which may vary based on sales of licensed products. In the first quarter of fiscal year 2026 and 2025, the Company received payments of approximately $30.8 million and $41.7 million, respectively, which were recognized as product revenues in the Company’s defense and advanced technologies segment for the six months ended September 30, 2025 and 2024, respectively. The Company may from time to time receive additional licensing and royalty payments under the settlement and licensing agreement.

Commitments and Contingencies

6 Months Ended

Sep. 30, 2025

Commitments and Contingencies Disclosure [Abstract]

Note 8 — Commitments and Contingencies

From time to time, the Company enters into satellite construction agreements as well as various other satellite-related purchase commitments, including with respect to the provision of launch services, operation of its satellites and satellite insurance. See Note 14 — Commitments to the consolidated financial statements included in the Company’s Annual Report on Form 10-K for the year ended March 31, 2025 for information regarding the Company’s future minimum payments under its satellite construction contracts and other satellite-related purchase commitments.

Periodically, the Company is involved in a variety of claims, suits, investigations and proceedings arising in the ordinary course of business, including government investigations and claims, and other claims and proceedings with respect to intellectual property, breach of contract, labor and employment, tax and other matters. Such matters could result in fines; penalties, compensatory, treble or other damages; or non-monetary relief. A violation of government contract laws and regulations could also result in the termination of its government contracts or debarment from bidding on future government contracts. Although claims, suits, investigations and proceedings are inherently uncertain and their results cannot be predicted with certainty, the Company believes that the resolution of its current pending matters will not have a material adverse effect on its business, financial condition, results of operations or liquidity.

The Company has contracts with various U.S. Government agencies. Accordingly, the Company is routinely subject to audit and review by the DCMA, the DCAA and other U.S. Government agencies of its performance on government contracts, indirect rates and pricing practices, accounting and management internal control business systems, and compliance with applicable contracting and procurement laws, regulations and standards. An adverse outcome to a review or audit or other failure to comply with applicable contracting and procurement laws, regulations and standards could result in material civil and criminal penalties and administrative sanctions being imposed on the Company, which may include termination of contracts, forfeiture of profits, triggering of price reduction clauses, suspension of payments, significant customer refunds, fines and suspension, or a prohibition on doing business with U.S. Government agencies. In addition, if the Company fails to obtain an “adequate” determination of its various accounting and management internal control business systems from applicable U.S. Government agencies or if allegations of impropriety are made against it, the Company could suffer serious harm to its business or its reputation, including its ability to bid on new contracts or receive contract renewals and its competitive position in the bidding process. As of September 30, 2025, the DCMA had approved the Company’s incurred costs through fiscal year 2022. The DCAA is currently auditing the Company's fiscal year 2024 recurring incurred cost submission. The Company's cost accounting practices are examined for compliance with the applicable CAS. Although the Company has recorded contract revenues subsequent to fiscal year 2022 based upon an estimate of costs that the Company believes will be approved upon final audit or review, the Company does not know the outcome of any ongoing or future audits or reviews and adjustments and if future adjustments exceed the Company’s estimates, its profitability would be adversely affected. The Company had $15.1 million and $14.8 million as of September 30, 2025 and March 31, 2025, respectively, in contract-related reserves for its estimate of potential refunds to customers for potential cost adjustments on several multi-year U.S. Government cost reimbursable contracts. This reserve is classified as either an element of accrued liabilities or as a reduction of unbilled accounts receivable based on the status of the related contracts.

In June 2025, Inmarsat agreed to a binding term sheet with Ligado Networks (Ligado) and AST & Science, LLC to settle Inmarsat's opposition to Ligado’s planned restructuring. Under the conditions set forth in the term sheet, the Company anticipates receiving $568 million from Ligado in fiscal year 2026, consisting of (i) a $420 million lump sum payment on October 31, 2025, (ii) a $100 million lump sum payment on March 31, 2026 and (iii) a resumption of quarterly payments of approximately $16 million, which started on September 30, 2025, with an annual escalator of 3% for the life of the contract (through 2107). On September 30, 2025, the Company received a $16.0 million quarterly payment and, subsequent to the second quarter of fiscal year 2026, based on the expiration of certain conditions, the Company received the lump sum payment of $420.0 million from Ligado.

In September 2023, the Company settled certain pending litigation. Under the terms of the settlement and licensing agreement, the Company receives certain payments, which may vary based on sales of licensed products. In the first quarter of fiscal year 2026 and 2025, the Company received payments of approximately $30.8 million and $41.7 million, respectively, which were recognized as product revenues in the Company’s defense and advanced technologies segment for the six months ended September 30, 2025 and 2024, respectively. The Company may from time to time receive additional licensing and royalty payments under the settlement and licensing agreement.