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, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation Of Revenue [Line Items]
Total revenues	$ 656,683	$ 609,157	$ 1,228,117	$ 1,179,937
Product [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	254,861	221,055	424,106	426,697
Service [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	401,822	388,102	804,011	753,240
Operating Segments [Member] | Satellite Services [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	300,547	300,110	612,647	574,227
Operating Segments [Member] | Satellite Services [Member] | Service [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	300,547	300,110	612,647	574,227
Operating Segments [Member] | Commercial Networks [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	180,027	134,806	292,811	253,402
Operating Segments [Member] | Commercial Networks [Member] | Product [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	159,831	118,935	253,406	220,466
Operating Segments [Member] | Commercial Networks [Member] | Service [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	20,196	15,871	39,405	32,936
Operating Segments [Member] | Government Systems [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	176,109	174,241	322,659	352,308
Operating Segments [Member] | Government Systems [Member] | Product [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	95,030	102,120	170,700	206,231
Operating Segments [Member] | Government Systems [Member] | Service [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	$ 81,079	$ 72,121	$ 151,959	$ 146,077