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Acquisitions - Additional Information (Detail) € in Millions |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 30, 2023 USD ($) shares | Apr. 30, 2021 USD ($) shares | Mar. 31, 2017 USD ($) | Sep. 30, 2023 USD ($) | Mar. 31, 2024 USD ($) shares | Mar. 31, 2023 USD ($) shares | Mar. 31, 2022 USD ($) | May 29, 2023 shares | Apr. 30, 2021 EUR (€)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares authorized | shares | 200,000,000 |  |  |  | 200,000,000 | 200,000,000 |  | 100,000,000 |
Net cash outlay after acquiree's cash on hand |  |  |  |  | $ 342,621,000 |  | $ 139,533,000 |  |
Shares issued in connection with acquisition of business |  |  |  |  |  |  | 207,169,000 |  |
Total revenues |  |  |  |  | 4,283,758,000 | $ 2,556,158,000 | 2,417,179,000 |  |
Net losses |  |  |  |  | 1,068,904,000 | (1,084,806,000) | 15,534,000 |  |
Operating Expense [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Severance costs |  |  |  |  | 48,000,000 |  |  |  |
EBI [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Equity method investment ownership percentage |  |  | 49.00% |  |  |  |  |  |
EBI Step Acquisition [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Percentage of additional interest in subsidiary acquired |  | 51.00% |  |  |  |  |  |  | 51.00%
Ownership percentage after completing the acquisition |  | 100.00% |  |  |  |  |  |  | 100.00%
The consideration transferred |  | $ 327,400,000 | $ 160,400,000 |  |  |  |  |  |
Payments to acquire business |  | 167,000,000 |  |  |  |  |  |  |
Euro Infrastructure Co.'s cash on hand |  | 121,700,000 |  |  |  |  |  |  |
Additional cash received from Euro Broadband Infrastructure Sarl step acquisition |  |  |  | $ 22,000,000 |  |  |  |  |
Net cash outlay after acquiree's cash on hand |  | $ 29,000,000 |  |  |  |  |  |  |
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) |  |  |  |  |  |  |
EBI Step Acquisition [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Amount of estimated purchase price consideration to be settled among the parties over the next 24 months from the closing date |  | $ 22,000,000 |  |  |  |  |  |  | € 20.0
RigNet, Inc [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
The consideration transferred |  | 317,900,000 |  |  |  |  |  |  |
Shares issued in connection with acquisition of business |  | $ 207,200,000 |  |  |  |  |  |  |
Shares issued in connection with acquisition of business, net of issuance costs, shares | shares |  | 4,000,000 |  |  |  |  |  |  |
Pay down of outstanding borrowings of acquiree |  | $ 107,300,000 |  |  |  |  |  |  |
Remaining amount payable |  |  |  |  | 0 |  |  |  |
Total revenues |  |  |  |  |  |  | 180,200,000 |  |
Net losses |  |  |  |  |  |  | 31,200,000 |  |
RigNet, Inc [Member] | Selling General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Merger-related transaction costs |  |  |  |  |  |  | 7,200,000 |  |
RigNet, Inc [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Contingent consideration liability |  | $ 13,800,000 |  |  |  |  |  |  |
Inmarsat Holdings [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
The consideration transferred | $ 2,700,000,000 |  |  |  |  |  |  |  |
Payments to acquire business | 550,700,000 |  |  |  |  |  |  |  |
Unfavorable contract liabilities included in current liabilities |  |  |  |  | 29,600,000 |  |  |  |
Unfavorable contract liabilities included in other long term liabilities |  |  |  |  | $ 248,300,000 |  |  |  |
Unfavorable contract liabilities weighted average estimated useful life |  |  |  |  | 9 years |  |  |  |
Shares issued in connection with acquisition of business | $ 2,100,000,000 |  |  |  |  |  |  |  |
Shares issued in connection with acquisition of business, net of issuance costs, shares | shares | 46,360,000 |  |  |  |  |  |  |  |
Total revenues |  |  |  |  | $ 1,400,000,000 |  |  |  |
Net losses |  |  |  |  | (214,600,000) |  |  |  |
Inmarsat Holdings [Member] | Selling General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquisition-related transaction costs |  |  |  |  | $ 31,300,000 | $ 40,400,000 | $ 26,300,000 |  |
Satellite Services [Member] | Inmarsat Holdings [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Preliminary estimated goodwill | $ 975,300,000 |  |  |  |  |  |  |  |
Government Systems [Member] | Inmarsat Holdings [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Preliminary estimated goodwill | $ 487,600,000 |  |  |  |  |  |  |  |

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