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, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Disaggregation Of Revenue [Line Items]
Total revenues	$ 651,444	$ 625,267	$ 1,890,059	$ 1,810,432
Product [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	249,315	226,708	682,769	658,355
Service [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	402,129	398,559	1,207,290	1,152,077
Operating Segments [Member] | Satellite Services [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	302,412	309,711	915,059	883,938
Operating Segments [Member] | Satellite Services [Member] | Service [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	302,412	309,711	915,059	883,938
Operating Segments [Member] | Commercial Networks [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	167,223	139,677	460,034	393,079
Operating Segments [Member] | Commercial Networks [Member] | Product [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	147,163	123,059	400,569	343,525
Operating Segments [Member] | Commercial Networks [Member] | Service [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	20,060	16,618	59,465	49,554
Operating Segments [Member] | Government Systems [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	181,809	175,879	514,966	533,415
Operating Segments [Member] | Government Systems [Member] | Product [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	102,152	103,649	282,200	314,830
Operating Segments [Member] | Government Systems [Member] | Service [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	$ 79,657	$ 72,230	$ 232,766	$ 218,585