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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Fair value of financial and nonfinancial obligations.

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Percentage of voting equity interests acquired in a business combination achieved in stages, excluding equity interests in the acquiree held by the acquirer immediately before the acquisition date.

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Amount of gain recognized in the period as a contingent gain.

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Year which long-term purchase commitment is set to expire, in CCYY format, for example, ‘2020’ represents the commitment expires in fiscal year 2020.

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Fair Value Measurements - Additional Information (Detail) € in Millions		6 Months Ended
	Apr. 30, 2021 USD ($)	Sep. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Apr. 30, 2021 EUR (€)
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
Euro Broadband Infrastructure Sarl 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 received €20.0 million, or approximately $22.0 million, in cash and recorded a gain of approximately $18.1 million in the second quarter of fiscal year 2024 in selling, general and administrative expenses in the condensed consolidated statements of operations and comprehensive income (loss).
Euro Broadband Infrastructure Sarl Step Acquisition [Member] \| Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingency gain recognized in current period		$ 18,100,000
Fair value estimate of the maximum amount of the contingency	$ 22,000,000			€ 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 2 [Member] \| Satellite Performance Incentives Obligation [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Satellite performance incentives obligation		18,000,000	20,000,000
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		646,600,000	661,500,000
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		518,300,000	561,700,000
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		277,000,000	292,000,000
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		47,800,000	57,100,000
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member] \| Inmarsat Senior Secured Notes 2026 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of long term debt		$ 484,400,000	$ 1,940,000,000