Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net income (loss)	$ (531,125)	$ (1,057,919)	$ 1,090,748
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	1,036,467	867,641	409,564
Amortization of intangible assets	324,340	289,883	90,813
Stock-based compensation expense	80,385	83,631	84,459
Ground network (FY25) and satellite (FY24) impairment, and disposition of fixed assets losses, net	152,898	975,383	45,892
Loss (gain) on extinguishment of debt, net	99,814
Deferred income taxes and other non-cash adjustments	(106,956)	(111,077)	380,672
Gain on disposition of business prior to costs to sell			(1,702,686)
Increase (decrease) in cash resulting from changes in operating assets and liabilities, net of effect of acquisition:
Accounts receivable	(59,726)	(69,156)	(128,149)
Inventories	33,223	(13,387)	(73,135)
Other assets	18,333	45,669	1,125
Accounts payable	40,462	(41,499)	35,514
Accrued liabilities	6,984	(141,610)	184,257
Other liabilities	(186,912)	(139,363)	(51,213)
Net cash provided by (used in) operating activities	908,187	688,196	367,861
Cash flows from investing activities:
Purchase of property, equipment and satellites, and other assets	(1,030,182)	(1,539,385)	(1,164,317)
Proceeds from insurance claims on satellites	251,500	508,560
Proceeds from sale of businesses	20,327		1,932,354
Payment related to acquisition of business, net of cash acquired		(342,621)
Proceeds from sale of short-term investments		164,266
Payments to acquire short-term investments		(82,000)
Net cash provided by (used in) investing activities	(758,355)	(1,291,180)	768,037
Cash flows from financing activities:
Proceeds from debt borrowings	1,975,000	1,736,539	540,000
Payments on debt borrowings	(2,390,713)	(567,033)	(576,474)
Payments of debt issuance costs	(36,284)	(53,179)	(1,511)
Proceeds from issuance of common stock under equity plans	18,018	19,294	21,686
Purchase of common stock in treasury (immediately retired) related to tax withholdings for stock-based compensation	(5,510)	(11,713)	(16,493)
Other financing activities	(3,102)	448	(3,336)
Repurchase of shares by majority-owned subsidiary			(30,000)
Net cash provided by (used in) financing activities	(442,591)	1,124,356	(66,128)
Effect of exchange rate changes on cash	3,831	275	(843)
Net increase (decrease) in cash and cash equivalents and restricted cash	(288,928)	521,647	1,068,927
Cash and cash equivalents and restricted cash at beginning of fiscal year	1,901,033	1,379,386	310,459
Cash and cash equivalents and restricted cash at end of fiscal year	1,612,105	1,901,033	1,379,386
Supplemental information:
Cash paid for interest (net of amounts capitalized)	390,043	228,965	11,000
Cash paid for income taxes, net	196,290	200,561	16,491
Non-cash investing and financing activities:
Issuance of common stock in satisfaction of certain accrued employee compensation liabilities	$ 28,063	31,173	27,619
Capital expenditures not paid for during the period		4,633	$ 72,630
Inmarsat [Member]
Non-cash investing and financing activities:
Issuance of common stock in connection with acquisition		$ 2,123,455