Senior Notes and Other Long-Term Debt - Components of Long-Term Debt (Detail) - USD ($) $ in Thousands	Jun. 30, 2026	Mar. 31, 2026
Debt Instrument [Line Items]
Finance lease obligations (see Note 1)	$ 142,678	$ 138,952
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other long-term debt	Other long-term debt
Total debt	$ 6,570,503	$ 6,585,115
Unamortized discount, debt issuance costs and fair value adjustments made in purchase accounting	(128,104)	(136,510)
Less: current portion of long-term debt	661,939	57,753
Total long-term debt	5,780,460	6,390,852
2022 Term Loan Facility [Member]
Debt Instrument [Line Items]
Principal amount of debt	672,000	673,750
2023 Term Loan Facility [Member]
Debt Instrument [Line Items]
Principal amount of debt	599,741	601,283
Inmarsat Term Loan Facility [Member]
Debt Instrument [Line Items]
Principal amount of debt	1,270,750	1,274,000
Ex-Im Credit Facility [Member]
Debt Instrument [Line Items]
Principal amount of debt	176,934	188,730
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

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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