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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Jul. 31, 2016 | Sep. 30, 2018 | Mar. 31, 2018
Unfavorable Regulatory Action [Member] |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
U.S. government contract-related reserves |  | $ 2.6 | $ 1.6
ViaSat-3 Class Satellites [Member] | Capital Addition [Member] |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Commitment amount | $ 379.5 |  |

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- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
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- Definition Amount of loss contingency liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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- Details
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- Details
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