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Composition of Certain Balance Sheet Captions - Composition of Certain Balance Sheet Captions (Parenthetical) (Detail) | 12 Months Ended
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Mar. 31, 2017
Capital Lease of Satellite Capacity - Anik F2 [Member] |
Schedule Of Composition Of Certain Balance Sheet Captions [Line Items] |
Property, equipment and satellites, estimated useful life (years) | 10 years
Furniture and Fixtures [Member] |
Schedule Of Composition Of Certain Balance Sheet Captions [Line Items] |
Property, equipment and satellites, estimated useful life (years) | 7 years
Building [Member] |
Schedule Of Composition Of Certain Balance Sheet Captions [Line Items] |
Property, equipment and satellites, estimated useful life (years) | 24 years
Minimum [Member] |
Schedule Of Composition Of Certain Balance Sheet Captions [Line Items] |
Property, equipment and satellites, estimated useful life (years) | 2 years
Minimum [Member] | Satellites [Member] |
Schedule Of Composition Of Certain Balance Sheet Captions [Line Items] |
Property, equipment and satellites, estimated useful life (years) | 10 years
Minimum [Member] | Equipment and Software [Member] |
Schedule Of Composition Of Certain Balance Sheet Captions [Line Items] |
Property, equipment and satellites, estimated useful life (years) | 2 years
Minimum [Member] | CPE Leased Equipment [Member] |
Schedule Of Composition Of Certain Balance Sheet Captions [Line Items] |
Property, equipment and satellites, estimated useful life (years) | 4 years
Minimum [Member] | Leasehold Improvements [Member] |
Schedule Of Composition Of Certain Balance Sheet Captions [Line Items] |
Property, equipment and satellites, estimated useful life (years) | 2 years
Maximum [Member] |
Schedule Of Composition Of Certain Balance Sheet Captions [Line Items] |
Property, equipment and satellites, estimated useful life (years) | 24 years
Maximum [Member] | Satellites [Member] |
Schedule Of Composition Of Certain Balance Sheet Captions [Line Items] |
Property, equipment and satellites, estimated useful life (years) | 17 years
Maximum [Member] | Equipment and Software [Member] |
Schedule Of Composition Of Certain Balance Sheet Captions [Line Items] |
Property, equipment and satellites, estimated useful life (years) | 7 years
Maximum [Member] | CPE Leased Equipment [Member] |
Schedule Of Composition Of Certain Balance Sheet Captions [Line Items] |
Property, equipment and satellites, estimated useful life (years) | 5 years
Maximum [Member] | Leasehold Improvements [Member] |
Schedule Of Composition Of Certain Balance Sheet Captions [Line Items] |
Property, equipment and satellites, estimated useful life (years) | 17 years

X
- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Extended line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | vsat_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=vsat_ComputerEquipmentAndSoftwareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |