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Contingencies - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2016
Loss Contingencies [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 |  |
Loss contingency impact to basic net income per share attributable to Viasat, Inc. common stockholders | $ 0.08 |  |
Loss contingency impact to diluted net income per share attributable to Viasat, Inc. common stockholders | $ 0.07 |  |
Unfavorable Regulatory Action [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
U.S. government contract-related reserves | $ 1.8 | $ 1.6 |
Accrued Liabilities [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Accrued total loss contingency | 8.8 |  |
Other Long Term Liabilities [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Accrued total loss contingency | $ 3.0 |  |
TrellisWare [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Minority interest ownership percentage by parent | 52.00% |  | 52.00%
Operating Segments [Member] | Government Systems [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Accrued total loss contingency | $ 11.8 |  |
Accrued loss contingency in uncharacterized damages | 11.4 |  |
Accrued loss contingency in penalties | $ 0.4 |  |

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