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Senior Notes and Other Long-Term Debt - Inmarsat Secured Credit Facility (Detail) - USD ($) |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 28, 2024 | Jun. 30, 2025 | Mar. 31, 2025 | Mar. 27, 2024
2024 Inmarsat Term Loan Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount of debt |  | $ 1,283,750,000 | $ 1,287,000,000 |
Credit Facility maximum borrowing capacity | $ 1,300,000,000 | $ 1,300,000,000 |  |
Inmarsat Secured Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit facility description | In March 2024, Inmarsat amended its then-existing senior secured credit facilities to (among other matters): (1) establish the $1.3 billion 2024 Inmarsat Term Loan Facility, the proceeds of which, together with cash on hand, were used to repay approximately $1.38 billion of the outstanding borrowings under the Original Inmarsat Term Loan Facility, resulting in $300.0 million in principal amount of borrowings remaining outstanding under the Original Inmarsat Term Loan Facility at the closing of the amendment, and (2) replace the prior $700.0 million revolving credit facility with a new $550.0 million revolving line of credit (including up to $100.0 million of letters of credit) (the Inmarsat Revolving Credit Facility and, together with the 2024 Inmarsat Term Loan Facility and the Original Inmarsat Term Loan Facility, the Inmarsat Secured Credit Facilities). |  |  |
Inmarsat Term Loan Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit facility description |  | The Inmarsat Secured Credit Facilities contain covenants that restrict, among other things, Inmarsat’s ability to incur additional debt, grant liens, sell assets, make investments and acquisitions, pay dividends and make certain other restricted payments. In addition, covenants regarding Inmarsat’s total net leverage ratio and interest coverage ratio apply to the Inmarsat Revolving Credit Facility. The borrowers under the Inmarsat Secured Credit Facilities were in compliance with the covenants under the Inmarsat Secured Credit Facilities as of June 30, 2025 |  |
Credit Facility interest rate description |  | Borrowings under the Inmarsat Secured Credit Facilities: (1) in the case of borrowings denominated in U.S. Dollars, bear interest, at Inmarsat's option, at either (i) the highest of (x) for the Original Inmarsat Term Loan Facility, the greater of the federal funds rate or the overnight banking fund rate for such day plus 0.50% and for the 2024 Inmarsat Term Loan Facility, the federal funds rate plus 0.50%, (y) the forward-looking one-month term SOFR rate plus 1.00% or (z) the administrative agent's prime rate as announced from time to time, or (ii) the forward-looking term SOFR rate for the applicable interest period (subject to, in the case of the 2024 Inmarsat Term Loan Facility, a floor of 0.50% per annum, in the case of the Inmarsat Revolving Credit Facility, a floor of 0.00% per annum and, in the case of the Original Inmarsat Term Loan Facility, a floor of 1.00% per annum), and (2) in the case of borrowings denominated in available currencies other than U.S. Dollars, bear interest based upon the applicable benchmark for such currencies (as described in the Inmarsat Secured Credit Facilities) plus, in all cases, an applicable margin. The applicable margin for the Original Inmarsat Term Loan Facility is 2.50% per annum for base rate loans and 3.50% per annum for SOFR loans. The applicable margin for the 2024 Inmarsat Term Loan Facility is 3.50% per annum for base rate loans and 4.50% per annum for SOFR loans. The applicable margin for borrowings under the Inmarsat Revolving Credit Facility is based on Inmarsat’s total net leverage ratio and ranges between 1.50% and 2.25% per annum for base rate loans and 2.50% and 3.25% per annum for SOFR loans. As of June 30, 2025, the effective interest rate on the Company's outstanding borrowings under the Inmarsat Term Loan Facilities was approximately 10.16%. The Inmarsat Secured Credit Facilities are required to be guaranteed by certain material Inmarsat subsidiaries and secured by substantially all of the assets of the Inmarsat borrowers and subsidiary guarantors. |  |
Effective interest rate |  | 10.16% |  |
Inmarsat Term Loan Facility [Member] | Inmarsat Original Term Loan Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding borrowings under the Credit Facility | $ 300,000,000 | $ 300,000,000 |  |
Maturity date |  | Dec. 12, 2026 |  |
Final installment payment at the maturity date | 300,000,000 |  |  |
Inmarsat Term Loan Facility [Member] | Original Inmarsat Term Loan Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayment of outstanding borrowings under the credit facility | 1,380,000,000 |  |  |
Term loan facility quarterly installments required to be repaid | $ 0 |  |  |
Inmarsat Term Loan Facility [Member] | 2024 Inmarsat Term Loan Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, date of first required payment | Jun. 30, 2024 |  |  |
Final installment payment at the maturity date | $ 1,230,000,000 |  |  |
Term loan facility quarterly installments required to be repaid | 3,250,000 |  |  |
Debt instrument unamortized discount percentage |  | 2.00% |  |
Inmarsat Term Loan Facility [Member] | Inmarsat New Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maturity date |  | Sep. 28, 2029 |  |
Inmarsat Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | $ 550,000,000 |  |
Credit Facility maximum borrowing capacity | 550,000,000 |  |  | $ 700,000,000
Maturity date |  | Mar. 28, 2027 |  |
Credit facility borrowings outstanding | 100,000,000 |  |  |
Inmarsat Revolving Credit Facility [Member] | Letter of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit Facility maximum borrowing capacity | $ 100,000,000 |  |  |
Standby letters of credit outstanding amount |  | $ 0 |  |

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