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Contingencies and Certain Matters Resolved During Fiscal Year 2015 - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Feb. 28, 2017 | Mar. 31, 2017 | Mar. 31, 2016
Loss Contingencies [Line Items] |  |  |
Accrued total loss contingency |  | $ 11.8 |
Loss contingency impact to net income attributable to ViaSat, Inc. stockholders | $ 4.0 | 4.0 |
Loss contingency impact to net (loss) income attributable to noncontrolling interests, net of tax | 3.7 | $ 3.7 |
Impact of loss contingency on earnings per share basic |  | $ 0.08 |
Impact of loss contingency on earnings per share diluted |  | $ 0.07 |
Trellis Ware [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 | $ 11.8 |
Accrued loss contingency in uncharacterized damages | 11.4 |  |
Accrued loss contingency in penalties | $ 0.4 |  |
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 |
Unfavorable Regulatory Action [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
U.S. government contract-related reserves |  | $ 1.8 | $ 2.5

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