The Company and a Summary of Its Significant Accounting Policies - Summary of Minority Interest (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Net income (loss) attributable to Viasat, Inc.	$ (574,962)	$ (1,068,904)	$ 1,084,806
Change from net income (loss) attributable to Viasat, Inc. and transfers from (to) noncontrolling interest	$ (574,962)	$ (1,068,904)	1,073,023
TrellisWare [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Transfers to noncontrolling interest			$ (11,783)