Acquisitions - Additional Information (Detail) shares in Thousands, € in Millions			1 Months Ended	12 Months Ended
	Nov. 08, 2021 USD ($) shares	Apr. 30, 2021 USD ($) shares	Mar. 31, 2017 USD ($)	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Apr. 30, 2021 EUR (€)
Business Acquisition [Line Items]
Net cash outlay after acquiree's cash on hand					$ 139,533,000
Shares issued in connection with acquisition of business					207,169,000
Total revenues				$ 2,556,158,000	2,417,179,000	$ 1,920,878,000
Net losses				(1,084,806,000)	$ 15,534,000	$ (3,691,000)
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		167,000,000.0
Euro Infrastructure Co.'s cash on hand		121,700,000
Net cash outlay after acquiree's cash on hand		$ 51,000,000.0
Contingent consideration arrangements		the Company may pay or receive up to €20.0 million, or approximately $21.6 million, in cash			up to plus or minus €20.0 million
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		$ 21,600,000					€ 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, shares | shares		4,000
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				$ 0	$ 7,200,000
RigNet, Inc [Member] | Maximum [Member]
Business Acquisition [Line Items]
Contingent consideration liability		$ 13,800,000
Inmarsat [Member]
Business Acquisition [Line Items]
Consideration payable under the Share Purchase Agreement in cash, subject to adjustments	$ 850,000,000.0
Consideration payable under the Share Purchase Agreement in common stock, subject to adjustments | shares	46,360
Reduction of cash purchase price consideration to be paid upon completion of acquisition	$ 299,300,000
Termination fee payable upon termination of the Share Purchase Agreement under certain circumstances	200,000,000.0
Reimbursement of certain out-of-pocket expenses of certain sellers upon termination of the Share Purchase Agreement under certain circumstances	40,000,000.0
Financing commitments in connection with acquisition	1,600,000,000
Inmarsat Legal Entity [Member]
Business Acquisition [Line Items]
Principal amount of senior secured debt	2,100,000,000
Outstanding indebtedness borrowings under the Credit Facility	$ 2,400,000,000