Basis of Presentation - Summary of Disaggregation of Revenue by Segment and Product and Services (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Disaggregation Of Revenue [Line Items]
Total revenues	$ 719,717	$ 575,559	$ 2,085,931	$ 1,660,325
Product [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	316,143	266,514	918,073	773,128
Service [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	403,574	309,045	1,167,858	887,197
Operating Segments [Member] | Satellite Services [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	309,711	220,789	883,938	638,660
Operating Segments [Member] | Satellite Services [Member] | Service [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	309,711	220,789	883,938	638,660
Operating Segments [Member] | Commercial Networks [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	139,677	90,099	393,079	236,121
Operating Segments [Member] | Commercial Networks [Member] | Product [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	123,059	75,690	343,525	197,560
Operating Segments [Member] | Commercial Networks [Member] | Service [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	16,618	14,409	49,554	38,561
Operating Segments [Member] | Government Systems [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	270,329	264,671	808,914	785,544
Operating Segments [Member] | Government Systems [Member] | Product [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	193,084	190,824	574,548	575,568
Operating Segments [Member] | Government Systems [Member] | Service [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	$ 77,245	$ 73,847	$ 234,366	$ 209,976