Commitments and Contingencies	3 Months Ended
Jun. 30, 2018
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 8 — Commitments and Contingencies In July 2016, the Company entered into two separate agreements with Boeing for the construction and purchase of two ViaSat-3 class satellites and the integration of Viasat’s payload technologies into the satellites. The aggregate purchase price for the two satellites is approximately $379.5 million (subject to purchase price adjustments based on factors such as launch delay and early delivery), plus an additional amount for launch support services to be performed by Boeing. In addition, under one of these agreements, the Company has the option to order up to two additional ViaSat-3 class satellites. The first ViaSat-3 class satellite is expected to provide broadband services over the Americas, and the second is expected to provide broadband services over the Europe, Middle East and Africa (EMEA) region. On June 1, 2017, the Company’s second-generation ViaSat-2 satellite was successfully launched into orbit. In January 2018, the Company previously reported an antenna deployment issue identified by the satellite manufacturer. In the fourth quarter of fiscal year 2018, the Company launched commercial broadband services on its ViaSat-2 satellite. The Company is now in the process of reviewing the antenna issue and related resulting damage with the insurers. Based on measured data and analysis of the current in-orbit performance of the satellite as well as the network as a whole, the Company currently expects that the issue will not materially impact the overall coverage area of the satellite, nor materially impact the planned services and the expected financial results from the ViaSat-2 system. The ViaSat-2 satellite was primarily financed by the Ex-Im Credit Facility (see Note 6 — Senior Notes and Other Long-Term Debt). Pursuant to the terms of the Ex-Im Credit Facility, certain insurance proceeds related to the ViaSat-2 satellite must be used to pay down outstanding borrowings under the Ex-Im Credit Facility if received. From time to time, the Company is involved in a variety of claims, suits, investigations and proceedings arising in the ordinary course of business, including government investigations and claims, and other claims and proceedings with respect to intellectual property, breach of contract, labor and employment, tax and other matters. Such matters could result in fines; penalties, compensatory, treble or other damages; or non-monetary relief. A violation of government contract laws and regulations could also result in the termination of its government contracts or debarment from bidding on future government contracts. Although claims, suits, investigations and proceedings are inherently uncertain and their results cannot be predicted with certainty, the Company believes that the resolution of its current pending matters will not have a material adverse effect on its business, financial condition, results of operations or liquidity. The Company has contracts with various U.S. government agencies. Accordingly, the Company is routinely subject to audit and review by the DCMA, the DCAA and other U.S. government agencies of its performance on government contracts, indirect rates and pricing practices, accounting and management internal control business systems, and compliance with applicable contracting and procurement laws, regulations and standards. An adverse outcome to a review or audit or other failure to comply with applicable contracting and procurement laws, regulations and standards could result in material civil and criminal penalties and administrative sanctions being imposed on the Company, which may include termination of contracts, forfeiture of profits, triggering of price reduction clauses, suspension of payments, significant customer refunds, fines and suspension, or a prohibition on doing business with U.S. government agencies. In addition, if the Company fails to obtain an “adequate” determination of its various accounting and management internal control business systems from applicable U.S. government agencies or if allegations of impropriety are made against it, the Company could suffer serious harm to its business or its reputation, including its ability to bid on new contracts or receive contract renewals and its competitive position in the bidding process. The Company’s incurred cost audits by the DCAA have not been concluded for fiscal years 2016 through 2018. As of June 30, 2018, the DCAA had completed its incurred cost audit for fiscal year 2004 and approved the Company’s incurred cost claims for fiscal years 2005 through 2015 without further audit. Although the Company has recorded contract revenues subsequent to fiscal year 2015 based upon an estimate of costs that the Company believes will be approved upon final audit or review, the Company does not know the outcome of any ongoing or future audits or reviews and adjustments, and if future adjustments exceed the Company’s estimates, its profitability would be adversely affected. As of June 30, 2018 and March 31, 2018, the Company had $1.6 million in contract-related reserves for its estimate of potential refunds to customers for potential cost adjustments on several multi-year U.S. government cost reimbursable contracts. This reserve is classified as either an element of accrued liabilities or as a reduction of unbilled accounts receivable based on the status of the related contracts.

Note 8 — Commitments and Contingencies

In July 2016, the Company entered into two separate agreements with Boeing for the construction and purchase of two ViaSat-3 class satellites and the integration of Viasat’s payload technologies into the satellites. The aggregate purchase price for the two satellites is approximately $379.5 million (subject to purchase price adjustments based on factors such as launch delay and early delivery), plus an additional amount for launch support services to be performed by Boeing. In addition, under one of these agreements, the Company has the option to order up to two additional ViaSat-3 class satellites. The first ViaSat-3 class satellite is expected to provide broadband services over the Americas, and the second is expected to provide broadband services over the Europe, Middle East and Africa (EMEA) region.

On June 1, 2017, the Company’s second-generation ViaSat-2 satellite was successfully launched into orbit. In January 2018, the Company previously reported an antenna deployment issue identified by the satellite manufacturer. In the fourth quarter of fiscal year 2018, the Company launched commercial broadband services on its ViaSat-2 satellite. The Company is now in the process of reviewing the antenna issue and related resulting damage with the insurers. Based on measured data and analysis of the current in-orbit performance of the satellite as well as the network as a whole, the Company currently expects that the issue will not materially impact the overall coverage area of the satellite, nor materially impact the planned services and the expected financial results from the ViaSat-2 system. The ViaSat-2 satellite was primarily financed by the Ex-Im Credit Facility (see Note 6 — Senior Notes and Other Long-Term Debt). Pursuant to the terms of the Ex-Im Credit Facility, certain insurance proceeds related to the ViaSat-2 satellite must be used to pay down outstanding borrowings under the Ex-Im Credit Facility if received.

From time to time, the Company is involved in a variety of claims, suits, investigations and proceedings arising in the ordinary course of business, including government investigations and claims, and other claims and proceedings with respect to intellectual property, breach of contract, labor and employment, tax and other matters. Such matters could result in fines; penalties, compensatory, treble or other damages; or non-monetary relief. A violation of government contract laws and regulations could also result in the termination of its government contracts or debarment from bidding on future government contracts. Although claims, suits, investigations and proceedings are inherently uncertain and their results cannot be predicted with certainty, the Company believes that the resolution of its current pending matters will not have a material adverse effect on its business, financial condition, results of operations or liquidity.

The Company has contracts with various U.S. government agencies. Accordingly, the Company is routinely subject to audit and review by the DCMA, the DCAA and other U.S. government agencies of its performance on government contracts, indirect rates and pricing practices, accounting and management internal control business systems, and compliance with applicable contracting and procurement laws, regulations and standards. An adverse outcome to a review or audit or other failure to comply with applicable contracting and procurement laws, regulations and standards could result in material civil and criminal penalties and administrative sanctions being imposed on the Company, which may include termination of contracts, forfeiture of profits, triggering of price reduction clauses, suspension of payments, significant customer refunds, fines and suspension, or a prohibition on doing business with U.S. government agencies. In addition, if the Company fails to obtain an “adequate” determination of its various accounting and management internal control business systems from applicable U.S. government agencies or if allegations of impropriety are made against it, the Company could suffer serious harm to its business or its reputation, including its ability to bid on new contracts or receive contract renewals and its competitive position in the bidding process. The Company’s incurred cost audits by the DCAA have not been concluded for fiscal years 2016 through 2018. As of June 30, 2018, the DCAA had completed its incurred cost audit for fiscal year 2004 and approved the Company’s incurred cost claims for fiscal years 2005 through 2015 without further audit. Although the Company has recorded contract revenues subsequent to fiscal year 2015 based upon an estimate of costs that the Company believes will be approved upon final audit or review, the Company does not know the outcome of any ongoing or future audits or reviews and adjustments, and if future adjustments exceed the Company’s estimates, its profitability would be adversely affected. As of June 30, 2018 and March 31, 2018, the Company had $1.6 million in contract-related reserves for its estimate of potential refunds to customers for potential cost adjustments on several multi-year U.S. government cost reimbursable contracts. This reserve is classified as either an element of accrued liabilities or as a reduction of unbilled accounts receivable based on the status of the related contracts.