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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands			3 Months Ended		12 Months Ended
	Mar. 31, 2026	Oct. 31, 2025	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Mar. 31, 2026
Loss Contingencies [Line Items]
Revenues			$ 1,156,543	$ 1,171,054
Ligado [Member]
Loss Contingencies [Line Items]
Revenue from contract with customer, excluding assessed tax, quarterly					$ 16,000
Inmarsat [Member]
Loss Contingencies [Line Items]
Contingent legal settlement escalator			3.00%
Contingent proceeds from legal settlements	$ 100,000					$ 568,000
Proceeds from legal settlements		$ 420,000
Product [Member]
Loss Contingencies [Line Items]
Revenues			$ 324,105	344,684
Product [Member] \| Defense and Advanced Technologies [Member] \| Positive Outcome Of Litigation [Member]
Loss Contingencies [Line Items]
Revenues			12,300	$ 30,800
Unfavorable Regulatory Action [Member]
Loss Contingencies [Line Items]
U.S. government contract-related reserves	$ 15,100		$ 15,100		$ 15,100	$ 15,100