Segment Information - Other Acquired Intangible Assets, Net and Goodwill Included in Segment Assets and Amortization of Acquired Intangible Assets by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Mar. 31, 2022
Segment Reporting Information [Line Items]
Other acquired intangible assets, net	$ 222,187		$ 236,043
Goodwill	187,359		190,113
Amortization of acquired intangible assets	7,523	$ 5,929
Operating Segments [Member] | Satellite Services [Member]
Segment Reporting Information [Line Items]
Other acquired intangible assets, net	220,199		233,740
Goodwill	79,739		81,972
Amortization of acquired intangible assets	7,228	5,322
Operating Segments [Member] | Commercial Networks [Member]
Segment Reporting Information [Line Items]
Goodwill	44,002		44,050
Operating Segments [Member] | Government Systems [Member]
Segment Reporting Information [Line Items]
Other acquired intangible assets, net	1,988		2,303
Goodwill	63,618		$ 64,091
Amortization of acquired intangible assets	$ 295	$ 607