Shares Used In Computing Diluted Net Income Per Share (Details) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 30, 2011	Dec. 31, 2010	Dec. 30, 2011	Dec. 31, 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	42,452	41,205	42,132	40,604
Weighted average options to purchase common stock as determined by application of the treasury stock method	1,352	1,636	1,371	1,638
Weighted average restricted stock units to acquire common stock as determined by application of the treasury stock method	422	392	407	422
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	107	119	105	135
Weighted average shares used in computing diluted net income per share attributable to ViaSat, Inc. common stockholders	44,333	43,352	44,015	42,799