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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2026 | Oct. 31, 2025 | Oct. 01, 2025 | Mar. 31, 2026 | Dec. 31, 2025 | Sep. 30, 2025 | Jun. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Mar. 31, 2026 | Mar. 31, 2025 | Mar. 28, 2024
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  | $ 1,140,893 |  | $ 1,122,262 |  | $ 2,311,947 | $ 2,248,722 |  |  |
Immarsat Original Term Loan Facility [ Member] | Inmarsat Term Loan Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of outstanding borrowings |  |  |  |  |  | 300,000 |  |  |  | 300,000 |  |  |  | $ 300,000
Ligado [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  | 16,000 |  |  |  | $ 16,000 |  |  |  |
Ligado [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent proceeds from legal settlements |  |  | $ 420,000 |  |  |  |  |  |  |  |  |  |  |
Ligado [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  | $ 16,000 | $ 16,000 |  |  |  |  |  |  |  |  |
Inmarsat [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent legal settlement escalator |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |
Inmarsat [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent proceeds from legal settlements |  | $ 420,000 |  |  |  |  |  |  |  |  |  |  |  |
Inmarsat [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent proceeds from legal settlements | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent and actual proceeds from legal settlements |  |  |  |  |  |  |  |  |  |  |  | $ 568,000 |  |
Inmarsat [Member] | Ligado [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent proceeds from legal settlements |  |  | $ 420,000 |  |  |  |  |  |  |  |  |  |  |
Product [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  | 319,383 |  | $ 323,948 |  | $ 664,067 | $ 629,687 |  |  |
Defense and Advanced Technologies [Member] | Positive Outcome Of Litigation [Member] | Product [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  | $ 30,800 |  | $ 41,700 |  |  |  |  |
Unfavorable Regulatory Action [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government contract-related reserves |  |  |  |  |  | $ 15,100 |  |  |  | $ 15,100 |  |  | $ 14,800 |

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