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, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Disaggregation Of Revenue [Line Items]
Total revenues	$ 1,128,539	$ 651,444	$ 3,133,745	$ 1,890,059
Product [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	303,073	249,315	941,174	682,769
Service [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	825,466	402,129	2,192,571	1,207,290
Operating Segments [Member] | Satellite Services [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	581,429	302,412	1,565,247	915,059
Operating Segments [Member] | Satellite Services [Member] | Service [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	581,429	302,412	1,565,247	915,059
Operating Segments [Member] | Commercial Networks [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	166,360	167,223	590,153	460,034
Operating Segments [Member] | Commercial Networks [Member] | Product [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	144,525	147,163	523,517	400,569
Operating Segments [Member] | Commercial Networks [Member] | Service [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	21,835	20,060	66,636	59,465
Operating Segments [Member] | Government Systems [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	380,750	181,809	978,345	514,966
Operating Segments [Member] | Government Systems [Member] | Product [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	158,548	102,152	417,657	282,200
Operating Segments [Member] | Government Systems [Member] | Service [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	$ 222,202	$ 79,657	$ 560,688	$ 232,766