Shares Used In Computing Diluted Net (Loss) Income Per Share - Shares Used In Computing Diluted Net Income (Loss) Per Share (Detail) - shares shares in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Common shares outstanding used in calculating basic net (loss) income per share attributable to Viasat, Inc. common stockholders	73,397	66,444	61,632
Weighted average restricted stock units to acquire common stock as determined by application of the treasury stock method		170
Weighted average potentially issuable shares in connection with certain terms of the Viasat 401(k) Profit Sharing Plan and Employee Stock Purchase Plan		406
Shares used in computing diluted net (loss) income per share attributable to Viasat, Inc. common stockholders	73,397	67,020	61,632