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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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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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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		12 Months Ended
	Apr. 30, 2021 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Apr. 30, 2021 EUR (€)
Satellite Performance Incentives Obligation [Member] \| Satellites [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 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		15,900,000	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		680,800,000	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		564,000,000	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		307,500,000	292,000,000
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member] \| 2031 Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of long term debt		529,900,000
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		38,500,000	$ 57,100,000
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member] \| Inmarsat Senior Secured Notes due 2026 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of long term debt		$ 2,040,000,000.00