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Fair Value Measurements - Additional Information (Detail) € in Millions |  | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) | Apr. 30, 2021 EUR (€) | Mar. 31, 2021 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2019 USD ($) | Sep. 30, 2017 USD ($)
Satellite Performance Incentives Obligation [Member] | ViaSat-1 Satellite [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Expiration year of in-orbit satellite performance incentive obligation |  | 2027 |  |  |  |  |
Satellite Performance Incentives Obligation [Member] | ViaSat-2 Satellite [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Expiration year of in-orbit satellite performance incentive obligation |  | 2028 |  |  |  |  |
2025 Notes [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Principal amount of senior notes issued |  | $ 700,000,000.0 |  |  |  |  | $ 700,000,000.0
2027 Notes [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Principal amount of senior notes issued |  | 600,000,000.0 |  |  |  | $ 600,000,000.0 |
2028 Notes [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Principal amount of senior notes issued |  | $ 400,000,000.0 |  |  | $ 400,000,000.0 |  |
Euro​ Infrastructure​ Co Step Acquisition [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Percentage of additional interest in subsidiary acquired | 51.00% |  | 51.00% |  |  |  |
Contingent consideration arrangements | the Company may pay or receive up to €20.0 million, or approximately $23.4 million, in cash. | up to plus or minus €20.0 million |  |  |  |  |
Euro​ Infrastructure​ Co Step Acquisition [Member] | Maximum [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Fair value estimate of the maximum amount of the contingency | $ 23,400,000 |  | € 20.0 |  |  |  |
Fair Value, Measurements, Recurring [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Liabilities measured at fair value on a recurring basis |  | $ 0 |  | $ 0 |  |  |
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Cash equivalents measured at fair value on a recurring basis |  | 5,000,000.0 |  | 5,000,000.0 |  |  |
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Satellite Performance Incentives Obligation [Member] | ViaSat-1 and ViaSat-2 Satellites [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Satellite performance incentives obligation |  | 25,600,000 |  | 27,100,000 |  |  |
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | 2025 Notes [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Fair value of long term debt |  | 708,100,000 |  | 709,600,000 |  |  |
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | 2027 Notes [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Fair value of long term debt |  | 624,000,000.0 |  | 629,200,000 |  |  |
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | 2028 Notes [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Fair value of long term debt |  | 420,300,000 |  | 420,500,000 |  |  |
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Ex-Im Credit Facility [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Fair value of long term debt |  | $ 89,500,000 |  | $ 100,100,000 |  |  |

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