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Senior Notes and Other Long-Term Debt - Components of Long-Term Debt (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Mar. 31, 2024
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Finance lease obligations (see Note 1) |  | $ 164,409 | $ 26,771
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] |  | Other long-term debt | Other long-term debt
Total debt |  | $ 7,218,294 | $ 7,475,842
Unamortized discount, debt issuance costs and fair value adjustments made in purchase accounting |  | (175,569) | (288,553)
Less: current portion of long-term debt |  | 506,922 | 58,054
Total long-term debt |  | 6,535,803 | 7,129,235
2024 Inmarsat Term Loan Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount of debt |  | 1,290,250 | 1,300,000
2022 Term Loan Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount of debt |  | 682,500 | 687,750
2023 Term Loan Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount of debt |  | 610,533 | 613,617
Inmarsat Original Term Loan Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount of debt |  | 300,000 | 300,000
Ex-Im Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount of debt |  | 19,652 | 39,304
2025 Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount of debt |  | 442,550 | 700,000
Inmarsat 2026 Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount of debt | [1] |  | 2,075,000
2027 Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount of debt |  | 600,000 | 600,000
2028 Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount of debt |  | 400,000 | 400,000
Inmarsat 2029 Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount of debt |  | 1,975,000 |
2031 Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount of debt |  | $ 733,400 | $ 733,400
[1] | On October 1, 2024, the Inmarsat 2026 Notes were repurchased and redeemed in full with the net proceeds of the Inmarsat 2029 Notes and cash on hand.

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