Acquisition - Additional Information (Detail) - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
	May 30, 2023	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Business Acquisition [Line Items]
Preliminary estimated goodwill		$ 1,622,132	$ 1,621,763
Total revenues		4,519,571	4,283,758	$ 2,556,158
Net losses		574,962	1,068,904	(1,084,806)
Operating Expense [Member]
Business Acquisition [Line Items]
Severance costs			48,000
Inmarsat Holdings [Member]
Business Acquisition [Line Items]
Preliminary estimated goodwill	$ 1,462,881
The consideration transferred	2,700,000
Payments to acquire business	550,700
Unfavorable contract liabilities included in current liabilities	29,600
Unfavorable contract liabilities included in other long term liabilities	248,300
Issuance of common stock in connection with acquisition	$ 2,100,000
Shares issued in connection with acquisition of business, net of issuance costs, shares	46,360
Total revenues			1,400,000
Net losses			214,600
Inmarsat Holdings [Member] | Selling General and Administrative Expenses [Member]
Business Acquisition [Line Items]
Acquisition-related transaction costs		0	31,300	$ 40,400
Communication Services [Member]
Business Acquisition [Line Items]
Preliminary estimated goodwill		$ 1,582,083	$ 1,581,937
Communication Services [Member] | Inmarsat Holdings [Member]
Business Acquisition [Line Items]
Preliminary estimated goodwill	$ 1,500,000