Basis of Presentation - Summary of Disaggregation of Revenue by Segment and Product and Services (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation Of Revenue [Line Items]
Total revenues	$ 1,225,415	$ 663,559	$ 2,005,206	$ 1,238,615
Product [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	401,729	260,959	638,101	433,454
Service [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	823,686	402,600	1,367,105	805,161
Operating Segments [Member] | Satellite Services [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	585,334	300,547	983,818	612,647
Operating Segments [Member] | Satellite Services [Member] | Service [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	585,334	300,547	983,818	612,647
Operating Segments [Member] | Commercial Networks [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	275,198	180,027	423,793	292,811
Operating Segments [Member] | Commercial Networks [Member] | Product [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	251,111	159,831	378,992	253,406
Operating Segments [Member] | Commercial Networks [Member] | Service [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	24,087	20,196	44,801	39,405
Operating Segments [Member] | Government Systems [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	364,883	182,985	597,595	333,157
Operating Segments [Member] | Government Systems [Member] | Product [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	150,618	101,128	259,109	180,048
Operating Segments [Member] | Government Systems [Member] | Service [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	$ 214,265	$ 81,857	$ 338,486	$ 153,109