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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