Senior Notes and Other Long-Term Debt - Inmarsat Secured Credit Facility (Detail) - USD ($)			3 Months Ended
	Mar. 28, 2024	Mar. 27, 2024	Jun. 30, 2024	Mar. 31, 2024
Inmarsat Secured Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility description			As of June 30, 2024, the Inmarsat Secured Credit Facilities comprised an aggregate of $1.6 billion of Inmarsat Term Loan Facilities (consisting of the new $1.3 billion New Term Loan Facility and $300.0 million in aggregate principal amount of outstanding borrowings under the prior Inmarsat term loan facility (the Original Term Loan Facility)) and Inmarsat's $550.0 million revolving line of credit (including up to $100.0 million of letters of credit) (the Inmarsat Revolving Credit Facility).
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, financial 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 financial covenants under the Inmarsat Secured Credit Facilities as of June 30, 2024.
Principal amount of debt			$ 1,596,750,000	$ 1,600,000,000
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 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 New 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 New 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 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 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 New 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, 2024, the weighted average effective interest rate on the Company's outstanding borrowings under the Inmarsat Term Loan Facilities, including the impact of interest rate cap contracts (see Note 1 — Basis of Presentation – Derivatives for more information), was approximately 9.48%. 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			9.48%
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
Repayment of outstanding borrowings under the credit facility	$ 1,380,000,000
Maturity date	Dec. 12, 2026
Final installment payment at the maturity date	$ 300,000,000
Term loan facility quarterly installments required to be repaid	0
Inmarsat Term Loan Facility [Member] | Inmarsat New Term Loan [Member]
Debt Instrument [Line Items]
Principal amount of debt	$ 1,300,000,000		$ 1,300,000,000
Maturity date	Sep. 28, 2029
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 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. 31, 2027	Dec. 31, 2024
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