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		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Weighted average common shares outstanding used in calculating basic net income per share attributable to ViaSat, Inc. common stockholders	49,503	48,205	49,319	48,052
Weighted average options to purchase common stock as determined by application of the treasury stock method	276	317	281	332
Weighted average restricted stock units to acquire common stock as determined by application of the treasury stock method	669	520	637	469
Weighted average potentially issuable shares in connection with certain terms of the ViaSat 401(k) Profit Sharing Plan and Employee Stock Purchase Plan	85	83	156	142
Weighted average shares used in computing diluted net income per share attributable to ViaSat, Inc. common stockholders	50,533	49,125	50,393	48,995