Shares Used In Computing Diluted Net Income (Loss) Per Share - Shares Used in Computing Diluted Net Income (Loss) Per Share (Detail) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 04, 2013	Sep. 28, 2012	Oct. 04, 2013	Sep. 28, 2012
Earnings Per Share [Abstract]
Weighted average common shares outstanding used in calculating basic net income (loss) per share attributable to ViaSat, Inc. common stockholders	45,484	43,615	45,304	43,399
Weighted average options to purchase common stock as determined by application of the treasury stock method	831		838
Weighted average restricted stock units to acquire common stock as determined by application of the treasury stock method	696		635
Weighted average potentially issuable shares in connection with certain terms of the amended ViaSat 401(k) Profit Sharing Plan and Employee Stock Purchase Plan equivalents	56		121
Weighted average shares used in computing diluted net income (loss) per share attributable to ViaSat, Inc. common stockholders	47,067	43,615	46,898	43,399