Document and Entity Information (USD $)	12 Months Ended
	Apr. 03, 2015	May 08, 2015	Oct. 03, 2014
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Apr. 03, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	FY
Trading Symbol	VSAT
Entity Registrant Name	VIASAT INC
Entity Central Index Key	0000797721
Current Fiscal Year End Date	--04-03
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		47,707,056
Entity Public Float			$ 2,415,318,451