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Fair Value Measurements - Additional Information (Detail) € in Millions |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2021 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Apr. 30, 2021 EUR (€)
Satellite Performance Incentives Obligation [Member] | Satellites [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Expiration year of in-orbit satellite performance incentive obligation |  |  | 2028 |  |
Euro Broadband Infrastructure Sarl Step Acquisition [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Percentage of additional interest in subsidiary acquired | 51.00% |  |  |  | 51.00%
Contingent consideration arrangements | the Company received €20.0 million, or approximately $22.0 million, in cash and recorded a gain of approximately $18.1 million in the second quarter of fiscal year 2024 in selling, general and administrative expenses in the condensed consolidated statements of operations and comprehensive income (loss). |  |  |  |
Euro Broadband Infrastructure Sarl Step Acquisition [Member] | Maximum [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingency gain recognized in current period |  | $ 18,100,000 |  |  |
Fair value estimate of the maximum amount of the contingency | $ 22,000,000 |  |  |  | € 20.0
Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Liabilities measured at fair value on a recurring basis |  |  | $ 0 | $ 0 |
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Satellite Performance Incentives Obligation [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Satellite performance incentives obligation |  |  | 13,800,000 | 15,900,000 |
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | 2025 Notes [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of long term debt |  |  | 437,000,000 | 680,800,000 |
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | 2027 Notes [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of long term debt |  |  | 565,800,000 | 564,000,000 |
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | 2028 Notes [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of long term debt |  |  | 311,500,000 | 307,500,000 |
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | 2031 Notes [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of long term debt |  |  | 502,400,000 | 529,900,000 |
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Ex-Im Credit Facility [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of long term debt |  |  | 29,100,000 | 38,500,000 |
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Inmarsat Senior Secured Notes 2026 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of long term debt |  |  | 1,970,000,000 | $ 2,040,000,000.00 |
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Inmarsat Senior Secured Notes 2029 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of long term debt |  |  | $ 1,920,000,000 |  |

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