Subsequent Event - Additional Information (Detail) - Subsequent Event [Member] € in Millions, $ in Millions	1 Months Ended
Feb. 29, 2016 EUR (€)	Jan. 31, 2016 USD ($)
Subsequent Event [Line Items]
Ownership percentage of issued and outstanding shares of an entity	49.00%
Payments to acquire the issued and outstanding shares of an entity \| €	€ 132.5
Minority interest ownership percentage of issued and outstanding shares of the Company's newly formed subsidiary	49.00%
Third Party Launch Services [Member]
Subsequent Event [Line Items]
Purchase price under agreement \| $		$ 115.0

The minimum amount the entity agreed to spend under the long-term purchase commitment.

No definition available.

Name:	us-gaap_LongTermPurchaseCommitmentAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Minority interest ownership percent by noncontrolling owners subject to customary conditions, including the receipt of required regulatory approvals and third party consents.

+ References

No definition available.

+ Details

Name:	vsat_MinorityInterestOwnershipPercentageByNoncontrollingOwnersSubjectToTransactionClosing
Namespace Prefix:	vsat_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Ownership percentage of the issued and outstanding shares of an entity subject to customary conditions, including the receipt of required regulatory approvals and third party consents.

+ References

No definition available.

+ Details

Name:	vsat_OwnershipPercentageOfIssuedAndOutstandingSharesOfEntitySubjectToTransactionClosing
Namespace Prefix:	vsat_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Payments to acquire less than 50% of the issued and outstanding shares of an entity subject to customary conditions, including the receipt of required regulatory approvals and third party consents.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=vsat_ThirdPartyLaunchServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: