Income Taxes - Components of Net Deferred Tax Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025
Deferred tax assets:
Net operating loss carryforwards	$ 388,035	$ 252,589
Tax credit carryforwards	178,366	159,806
Capitalized research and development costs	65,417	136,191
Operating lease liabilities	99,134	99,877
Interest carryforwards	34,260	105,182
Other	182,575	198,071
Valuation allowance	(434,983)	(430,501)
Total deferred tax assets	512,804	521,215
Deferred tax liabilities:
Intangible assets	(533,515)	(576,599)
Property, equipment and satellites	(776,440)	(689,880)
Operating lease assets	(91,280)	(88,083)
Other	(59,720)	(75,918)
Total deferred tax liabilities	(1,460,955)	(1,430,480)
Net deferred tax assets (liabilities)	$ (948,151)	$ (909,265)