Goodwill and Acquired Intangible Assets - Allocation of Other Acquired Intangible Assets and Related Accumulated Amortization (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life	7 years
Other acquired intangible assets, gross	$ 151,549	$ 213,281
Other acquired intangible assets, accumulated amortization	(141,981)	(198,842)
Other acquired intangible assets, net	$ 9,568	14,439
Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life	6 years
Other acquired intangible assets, gross	$ 78,185	89,228
Other acquired intangible assets, accumulated amortization	(71,549)	(78,935)
Other acquired intangible assets, net	$ 6,636	10,293
Contracts and Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life	8 years
Other acquired intangible assets, gross	$ 55,161	103,114
Other acquired intangible assets, accumulated amortization	(52,229)	(98,968)
Other acquired intangible assets, net	$ 2,932	4,146
Satellite Co-Location Rights [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life	9 years
Other acquired intangible assets, gross	$ 8,600	8,600
Other acquired intangible assets, accumulated amortization	$ (8,600)	(8,600)
Trade Name [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life	3 years
Other acquired intangible assets, gross	$ 5,940	5,940
Other acquired intangible assets, accumulated amortization	$ (5,940)	(5,940)
Other [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life	7 years
Other acquired intangible assets, gross	$ 3,663	6,399
Other acquired intangible assets, accumulated amortization	$ (3,663)	$ (6,399)