Shares Used In Computing Diluted Net Income (Loss) Per Share - Shares Used In Computing Diluted Net Income (Loss) Per Share (Detail) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Shares Used In Computing Diluted Net Income Loss Per Share [Line Items]
Weighted average common shares outstanding used in calculating basic net (loss) income per share attributable to Viasat, Inc. common stockholders	73,917	67,995	73,004	65,704
Weighted average restricted stock units to acquire common stock as determined by application of the treasury stock method		108	869
Weighted average potentially issuable shares in connection with certain terms of the Viasat 401(k) Profit Sharing Plan and Employee Stock Purchase Plan		565	433
Weighted average shares used in computing diluted net (loss) income per share attributable to Viasat, Inc. common stockholders	73,917	68,668	74,348	65,704
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			8
TSR Performance Stock Options [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			34