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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands				3 Months Ended						6 Months Ended		12 Months Ended
	Mar. 31, 2026	Oct. 31, 2025	Oct. 01, 2025	Mar. 31, 2026	Dec. 31, 2025	Sep. 30, 2025	Jun. 30, 2025	Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Mar. 31, 2026	Mar. 31, 2025	Mar. 28, 2024
Loss Contingencies [Line Items]
Revenues						$ 1,140,893		$ 1,122,262		$ 2,311,947	$ 2,248,722
Immarsat Original Term Loan Facility [ Member] \| Inmarsat Term Loan Facility [Member]
Loss Contingencies [Line Items]
Principal amount of outstanding borrowings						300,000				300,000				$ 300,000
Ligado [Member]
Loss Contingencies [Line Items]
Revenues						16,000				$ 16,000
Ligado [Member] \| Subsequent Event [Member]
Loss Contingencies [Line Items]
Contingent proceeds from legal settlements			$ 420,000
Ligado [Member] \| Forecast [Member]
Loss Contingencies [Line Items]
Revenues				$ 16,000	$ 16,000
Inmarsat [Member]
Loss Contingencies [Line Items]
Contingent legal settlement escalator										3.00%
Inmarsat [Member] \| Subsequent Event [Member]
Loss Contingencies [Line Items]
Contingent proceeds from legal settlements		$ 420,000
Inmarsat [Member] \| Forecast [Member]
Loss Contingencies [Line Items]
Contingent proceeds from legal settlements	$ 100,000
Contingent and actual proceeds from legal settlements												$ 568,000
Inmarsat [Member] \| Ligado [Member] \| Subsequent Event [Member]
Loss Contingencies [Line Items]
Contingent proceeds from legal settlements			$ 420,000
Product [Member]
Loss Contingencies [Line Items]
Revenues						319,383		$ 323,948		$ 664,067	$ 629,687
Defense and Advanced Technologies [Member] \| Positive Outcome Of Litigation [Member] \| Product [Member]
Loss Contingencies [Line Items]
Revenues							$ 30,800		$ 41,700
Unfavorable Regulatory Action [Member]
Loss Contingencies [Line Items]
U.S. government contract-related reserves						$ 15,100				$ 15,100			$ 14,800