Shares Used In Computing Diluted Net Income Per Share - Shares Used in Computing Diluted Net Income Per Share (Detail) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Weighted average common shares outstanding used in calculating basic net income per share attributable to ViaSat, Inc. common stockholders	52,976	48,712	50,542	48,275
Weighted average options to purchase common stock as determined by application of the treasury stock method	235	229	265	297
Weighted average restricted stock units to acquire common stock as determined by application of the treasury stock method	629	529	656	502
Weighted average potentially issuable shares in connection with certain terms of the ViaSat 401(k) Profit Sharing Plan and Employee Stock Purchase Plan	175	160	184	156
Weighted average shares used in computing diluted net income per share attributable to ViaSat, Inc. common stockholders	54,015	49,630	51,647	49,230