Shares Used In Computing Diluted Net Income Per Share (Details) In Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2011	Oct. 01, 2010	Sep. 30, 2011	Oct. 01, 2010
Shares used in computing diluted net income per share
Weighted average common shares outstanding used in calculating basic net income per share attributable to ViaSat, Inc. common stockholders	42,142	40,640	41,972	40,304
Weighted average options to purchase common stock as determined by application of the treasury stock method	1,311	1,625	1,375	1,624
Weighted average restricted stock units to acquire common stock as determined by application of the treasury stock method	348	385	377	411
Weighted average potentially issuable shares in connection with certain terms of the amended ViaSat 401(k) Profit Sharing Plan	83	59	114	99
Weighted average Employee Stock Purchase Plan equivalents	10	8	22	28
Weighted average shares used in computing diluted net income per share attributable to ViaSat, Inc. common stockholders	43,894	42,717	43,860	42,466