Shares Used in Computing Diluted Net Income per Share (Detail) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 28, 2012	Sep. 30, 2011	Sep. 28, 2012	Sep. 30, 2011
Earnings Per Share [Line Items]
Weighted average common shares outstanding used in calculating basic net income per share attributable to ViaSat, Inc. common stockholders	43,615	42,142	43,399	41,972
Weighted average options to purchase common stock as determined by application of the treasury stock method		1,311		1,375
Weighted average restricted stock units to acquire common stock as determined by application of the treasury stock method		348		377
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		93		136
Weighted average shares used in computing diluted net income per share attributable to ViaSat, Inc. common stockholders	43,615	43,894	43,399	43,860