Shares Used In Computing Diluted Net Income (Loss) Per Share - Shares Used In Computing Diluted Net Income (Loss) Per Share (Detail) - shares	3 Months Ended		9 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024
Shares Used In Computing Diluted Net Income Loss Per Share [Line Items]
Weighted average shares used in computing basic net income (loss) per share attributable to Viasat, Inc. common stockholders	135,730,000	128,941,000	134,148,000	127,968,000
Weighted average shares used in computing diluted net (loss) income per share attributable to Viasat, Inc. common stockholders	140,915,000	128,941,000	134,148,000	127,968,000
Market Based Performance Stock Options And Market Based Performance Stock Units [Member]
Shares Used In Computing Diluted Net Income Loss Per Share [Line Items]
Weighted average options to purchase common stock as determined by application of the treasury stock method	628,000
Viasat 401(k) Profit Sharing Plan and Employee Stock Purchase Plan [Member]
Shares Used In Computing Diluted Net Income Loss Per Share [Line Items]
Weighted average options to purchase common stock as determined by application of the treasury stock method	819,000
Employee Stock Option [Member]
Shares Used In Computing Diluted Net Income Loss Per Share [Line Items]
Weighted average options to purchase common stock as determined by application of the treasury stock method	28,000
Restricted Stock Units (RSUs) [Member]
Shares Used In Computing Diluted Net Income Loss Per Share [Line Items]
Weighted average options to purchase common stock as determined by application of the treasury stock method	3,554,000
Performance Shares [Member]
Shares Used In Computing Diluted Net Income Loss Per Share [Line Items]
Weighted average options to purchase common stock as determined by application of the treasury stock method	156,000