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Fair Value Measurements - Additional Information (Detail) - USD ($) | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Sep. 28, 2023
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 |  |  |
2025 Notes [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Interest rate on the outstanding borrowings | 5.625% |  |  |
2027 Notes [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Interest rate on the outstanding borrowings | 5.625% |  |  |
2028 Notes [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Interest rate on the outstanding borrowings | 6.50% |  |  |
2031 Notes [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Interest rate on the outstanding borrowings |  |  |  | 7.50%
Ex-Im Credit Facility [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Interest rate on the outstanding borrowings | 2.38% |  |  |
Inmarsat Senior Secured Notes 2029 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Interest rate on the outstanding borrowings |  |  | 9.00% |
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 | 8,500,000 | 11,400,000 |  |
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 |  | $ 438,600,000 |  |
Interest rate on the outstanding borrowings |  | 5.625% |  |
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 | 597,700,000 | $ 575,000,000 |  |
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 | 389,500,000 | 350,000,000 |  |
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 | 685,700,000 | 552,800,000 |  |
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 | 9,700,000 | 19,200,000 |  |
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 | $ 2,080,000,000.00 | $ 1,820,000,000 |  |

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