Income Taxes - Components of Net Deferred Tax Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Deferred tax assets:
Net operating loss carryforwards	$ 197,486	$ 184,177
Tax credit carryforwards	220,060	189,970
Other	57,246	52,958
Deferred revenue	24,421	1,127
Valuation allowance	(33,499)	(29,049)
Total deferred tax assets	465,714	399,183
Deferred tax liabilities:
Intangible assets	(72,776)	(73,403)
Property, equipment and satellites	(113,188)	(96,661)
Other	(21,160)	(7,709)
Total deferred tax liabilities	(207,124)	(177,773)
Net deferred tax assets	$ 258,590	$ 221,410