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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 30, 2017 | Jul. 31, 2016 | May 31, 2013 | Mar. 31, 2017 | Dec. 31, 2017 | Mar. 31, 2016
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |
Loss contingency impact to net income attributable to Viasat, Inc. stockholders |  |  |  | $ 4.0 |  |
Loss contingency impact to net (loss) income attributable to noncontrolling interests, net of tax |  |  |  | 3.7 |  |
TrellisWare [Member] |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |
Minority interest ownership percentage by parent |  |  |  |  |  | 52.00%
Operating Segments [Member] | Government Systems [Member] |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |
Accrued total loss contingency |  |  |  | 11.8 |  |
Accrued loss contingency in uncharacterized damages |  |  |  | 11.4 |  |
Accrued loss contingency in penalties |  |  |  | 0.4 |  |
Accrued Liabilities [Member] |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |
Accrued total loss contingency |  |  |  |  | $ 11.8 |
Unfavorable Regulatory Action [Member] |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |
U.S. government contract-related reserves |  |  |  | $ 1.8 | $ 1.3 |
Satellite - ViaSat-2 [Member] | Capital Addition [Member] |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |
Commitment amount |  |  | $ 358.0 |  |  |
Satellite - ViaSat-2 [Member] | Satellite Performance Incentives Obligation [Member] |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |
Commitment amount | $ 21.0 |  |  |  |  |
Period of in-orbit satellite performance incentive payments | 9 years |  |  |  |  |
ViaSat-3 Class Satellites [Member] | Capital Addition [Member] |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |
Commitment amount |  | $ 379.5 |  |  |  |

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- Definition Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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