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Senior Notes and Other Long-Term Debt - Additional Information (Detail) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 21, 2017 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) Installment | Mar. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |
Loss on extinguishment of debt |  |  | $ (10,217,000) |
Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit Facility maximum borrowing capacity |  |  | $ 800,000,000 |
Maturity date of the Credit Facility |  |  | May 24, 2021 |
Credit Facility interest rate description |  |  | Borrowings under the Revolving Credit Facility bear interest, at the Company's option, at either (1) the highest of the Federal Funds rate plus 0.50%, the Eurodollar rate plus 1.00%, or the administrative agent's prime rate as announced from time to time, or (2) the Eurodollar rate, plus, in the case of each of (1) and (2), an applicable margin that is based on the Company's total leverage ratio. |
Credit facility description |  |  | The Revolving Credit Facility contains financial covenants regarding a maximum total leverage ratio and a minimum interest coverage ratio. In addition, the Revolving Credit Facility contains covenants that restrict, among other things, the Company’s ability to sell assets, make investments and acquisitions, make capital expenditures, grant liens, pay dividends and make certain other restricted payments. |
Borrowing availability under the Credit Facility |  |  | $ 770,900,000 |
Principal amount of outstanding borrowings under the Credit Facility |  |  | 0 | $ 0
Letter of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit Facility maximum borrowing capacity |  |  | 150,000,000 |
Standby letters of credit outstanding amount |  |  | 29,100,000 |
Ex-Im Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit Facility maximum borrowing capacity |  |  | $ 362,400,000 |
Credit facility description |  |  | The Ex-Im Credit Facility contains financial covenants regarding Viasat's maximum total leverage ratio and minimum interest coverage ratio. In addition, the Ex-Im Credit Facility contains covenants that restrict, among other things, the Company's ability to sell assets, make investments and acquisitions, make capital expenditures, grant liens, pay dividends and make certain other restricted payments. |
Amount of qualified ViaSat-2 satellite costs limited to finance |  |  | $ 321,200,000 |
Percent of qualified ViaSat-2 expenses used to finance |  |  | 85.00% |
The maximum exposure fees under Ex-Im Credit Facility |  |  | $ 41,200,000 |
Interest rate on the outstanding borrowings |  |  | 2.38% |
Required number of installment repayments | Installment |  |  | 16 |
Debt maturity date |  |  | Oct. 15, 2025 |
Effective interest rate on the Ex-Im Credit Facility |  |  | 4.60% |
Ex-Im credit facility repayment commencing date |  |  | Apr. 15, 2018 |
Cumulative Ex-Im Credit Facility loan discount |  |  | $ 42,300,000 |
Exposure fees included in the principal |  |  | 35,300,000 | 29,500,000
The exposure fees paid under Ex-Im Credit Facility borrowings |  |  | 6,000,000 |
2020 Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amounts of Senior Notes issued | $ 575,000,000 |  |  | $ 575,000,000
Loss on extinguishment of debt |  | $ (10,200,000) | (10,217,000) |
Cash payment on extinguishment of debt |  | $ 10,600,000 | 10,602,000 |
2020 Notes [Member] | Tender Offer [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount deposited to redeem debt | 309,300,000 |  |  |
Aggregate principal amount | $ 298,200,000 |  |  |
2020 Notes [Member] | Redemption [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption price percentage of Senior Notes | 101.719% |  |  |
Amount deposited to redeem debt | $ 287,400,000 |  |  |
Aggregate principal amount | $ 276,800,000 |  |  |
2025 Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on the outstanding borrowings | 5.625% |  |  |
Principal amounts of Senior Notes issued | $ 700,000,000 |  | $ 700,000,000 |
2025 Notes [Member] | Debt Instrument, Redemption, Period Two [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption price percentage of Senior Notes |  |  | 102.813% |
Redemption description of Senior Notes |  |  | In whole or in part, at any time during the 12 months beginning on September 15, 2020 at a redemption price of 102.813%. |
2025 Notes [Member] | Debt Instrument, Redemption, Period Three [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption price percentage of Senior Notes |  |  | 101.406% |
Redemption description of Senior Notes |  |  | During the 12 months beginning on September 15, 2021 at a redemption price of 101.406% |
2025 Notes [Member] | Change of Control [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption price percentage of Senior Notes |  |  | 101.00% |
Redemption description of Senior Notes |  |  | In the event a change of control triggering event occurs (as defined in the indenture), each holder will have the right to require the Company to repurchase all or any part of such holder’s 2025 Notes at a purchase price in cash equal to 101% of the aggregate principal amount of the 2025 Notes repurchased, plus accrued and unpaid interest, if any, to the date of purchase (subject to the right of holders of record on the relevant record date to receive interest due on the relevant interest payment date). |
2025 Notes [Member] | Debt Instrument, Redemption, Period Four [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption price percentage of Senior Notes |  |  | 100.00% |
Redemption description of Senior Notes |  |  | And at any time on or after September 15, 2022 at a redemption price of 100%, in each case plus accrued and unpaid interest, if any, thereon to the redemption date. |
2025 Notes [Member] | Debt Instrument, Redemption, Other Period One [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption price percentage of Senior Notes |  |  | 105.625% |
Redemption description of Senior Notes |  |  | Prior to September 15, 2020, the Company may redeem up to 40% of the 2025 Notes at a redemption price of 105.625% of the principal amount thereof, plus accrued and unpaid interest, if any, thereon to the redemption date, from the net cash proceeds of specified equity offerings. |
2025 Notes [Member] | Debt Instrument, Redemption, Period One [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption price percentage of Senior Notes |  |  | 100.00% |
Redemption description of Senior Notes |  |  | The Company may also redeem the 2025 Notes prior to September 15, 2020, in whole or in part, at a redemption price equal to 100% of the principal amount thereof plus the applicable premium and any accrued and unpaid interest, if any, thereon to the redemption date. The applicable premium is calculated as the greater of: (i) 1.0% of the principal amount of such 2025 Notes and (ii) the excess, if any, of (a) the present value at such date of redemption of (1) the redemption price of such 2025 Notes on September 15, 2020 plus (2) all required interest payments due on such 2020 Notes through September 15, 2020 (excluding accrued but unpaid interest to the date of redemption), computed using a discount rate equal to the treasury rate (as defined under the indenture) plus 50 basis points, over (b) the then-outstanding principal amount of such 2025 Notes. |

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