Shares Used In Computing Diluted Net Income (Loss) Per Share - Additional Information (Detail) - shares	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Employee Stock Option
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares	220,095	242,973	483,499
Market-Based Performance Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares	0	0	480,325
RSU [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares	5,539,871	2,066,973	2,477,067
Performance-Based Performance Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares	165,498	0	0
Viasat 401(k) Profit Sharing Plan and Employee Stock Purchase Plan [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares	1,950,692	1,127,606	699,680