Income Taxes - Components of Net Deferred Tax Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Mar. 31, 2024
Deferred tax assets:
Net operating loss carryforwards	$ 252,589	$ 198,548
Tax credit carryforwards	159,806	141,015
Capitalized research and development costs	136,191	143,581
Operating lease liabilities	99,877	94,360
Interest carryforwards	105,182	88,269
Other	198,071	201,160
Valuation allowance	(430,501)	(353,642)
Total deferred tax assets	521,215	513,291
Deferred tax liabilities:
Intangible assets	(576,599)	(683,366)
Property, equipment and satellites	(689,880)	(725,990)
Operating lease assets	(88,083)	(80,258)
Other	(75,918)	(88,357)
Total deferred tax liabilities	(1,430,480)	(1,577,971)
Net deferred tax liabilities	$ (909,265)	$ (1,064,680)