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v3.25.3

Senior Notes and Other Long-Term Debt - Components of Long-Term Debt (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Mar. 31, 2025
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Finance lease obligations (see Note 1) |  | $ 150,701 | $ 158,473
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] |  | Other long-term debt | Other long-term debt
Total debt |  | $ 6,731,043 | $ 7,204,275
Unamortized discount, debt issuance costs and fair value adjustments made in purchase accounting |  | (146,808) | (168,166)
Less: current portion of long-term debt |  | 49,503 | 503,825
Total long-term debt |  | 6,534,732 | 6,532,284
2024 Inmarsat Term Loan Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount of debt |  | 1,280,500 | 1,287,000
2022 Term Loan Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount of debt |  | 677,250 | 680,750
2023 Term Loan Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount of debt |  | 604,366 | 607,450
Immarsat 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 | [1] | 9,826 | 19,652
2025 Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount of debt | [2] |  | 442,550
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 | 1,975,000
2031 Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount of debt |  | $ 733,400 | $ 733,400
[1] | Subsequent to the second quarter of fiscal year 2026, the Ex-Im Credit Facility was fully repaid at maturity on October 15, 2025.
[2] | On May 2, 2025, the 2025 Notes were redeemed in full.

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