Cash Received and Cash Paid (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Sep. 28, 2012	Sep. 30, 2011
Telesat Canada-ordinary course of business [Member]
Cash received and cash paid
Cash received		$ 1,946
Cash paid	3,675	4,834
Loral - satellite construction contract [Member]
Cash received and cash paid
Cash paid		$ 1,283

Amounts paid to related parties by ViaSat related to satellite construction contract and in the ordinary course of business.

No definition available.

Name:	vsat_RelatedPartyTransactionAmountsPaidToRelatedParty
Namespace Prefix:	vsat_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration