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Subsequent Event - Additional Information (Detail) - Subsequent Event [Member] shares in Thousands, $ in Millions | Nov. 08, 2021 USD ($) shares
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Inmarsat [Member] |
Subsequent Event [Line Items] |
Principal amount of senior secured debt | $ 2,100.0
Outstanding borrowings under the Credit Facility | 1,700.0
Financing commitments | 2,400.0
Inmarsat [Member] |
Subsequent Event [Line Items] |
Consideration payable under the Share Purchase Agreement in cash, subject to adjustments | $ 850.0
Consideration payable under the Share Purchase Agreement in common stock, subject to adjustments | shares | 46,360
Termination fee payable upon termination of the Share Purchase Agreement under certain circumstances | $ 200.0
Reimbursement of certain out-of-pocket expenses of certain sellers upon termination of the Share Purchase Agreement under certain circumstances | 40.0
Financing commitments in connection with acquisition | 2,300.0
Commitment obtained to backstop certain amendments required under current credit facilities | $ 3,200.0

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- 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

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- Definition The total cash consideration to be paid by the Company upon completion of acquisition. + References No definition available. + Details
Name: | vsat_CashPurchasePriceConsiderationToBePaidUponCompletionOfAcquisition
Namespace Prefix: | vsat_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Commitments to backstop certain amendments required under credit facilities. + References No definition available. + Details
Name: | vsat_CommitmentsToBackstopCertainAmendmentsRequiredUnderCreditFacilities
Namespace Prefix: | vsat_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The common stock shares consideration to be paid by the Company upon completion of acquisition. + References No definition available. + Details
Name: | vsat_CommonStockPurchasePriceSharesConsiderationToBePaidUponCompletionOfAcquisition
Namespace Prefix: | vsat_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition New financing commitments obtained in connection with acquisition. + References No definition available. + Details
Name: | vsat_NewFinancingCommitmentsInConnectionWithAcquisition
Namespace Prefix: | vsat_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Possible maximum termination fee option One per the Share Purchase Agreement that contains certain termination rights for both the Company and certain of the Sellers, upon termination of the Share Purchase Agreement under certain circumstances. + References No definition available. + Details
Name: | vsat_SharePurchaseAgreementMaximumTerminationFeeOptionOne
Namespace Prefix: | vsat_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Possible termination fee option two per the Share Purchase Agreement that contains certain termination rights for both the Company and certain of the Sellers, upon termination of the Share Purchase Agreement under certain circumstances. + References No definition available. + Details
Name: | vsat_SharePurchaseAgreementTerminationFeeOptionTwo
Namespace Prefix: | vsat_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Target company’s outstanding balance of credit facility to be assumed upon completion of acquisition. + References No definition available. + Details
Name: | vsat_TargetCompanyCreditFacilityToBeAssumedUponCompletionOfAcquisition
Namespace Prefix: | vsat_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Target company’s outstanding balance of credit facility to be assumed upon completion of acquisition. + References No definition available. + Details
Name: | vsat_TargetCompanyOutstandingBalanceOfCreditFacilityToBeAssumedUponCompletionOfAcquisition
Namespace Prefix: | vsat_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Target company’s senior secured debt to be assumed upon completion of acquisition. + References No definition available. + Details
Name: | vsat_TargetCompanySeniorSecuredDebtToBeAssumedUponCompletionOfAcquisition
Namespace Prefix: | vsat_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Details
Name: | dei_LegalEntityAxis=vsat_InmarsatMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=vsat_InmarsatMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |