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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, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Disaggregation Of Revenue [Line Items]        
Total revenues $ 588,224 $ 554,694 $ 1,717,517 $ 1,511,037
Product [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues 303,090 301,865 873,535 800,429
Service [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues 285,134 252,829 843,982 710,608
Operating Segments [Member] | Satellite Services [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues 211,700 177,651 614,232 494,174
Operating Segments [Member] | Satellite Services [Member] | Service [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues 211,700 177,651 614,232 494,174
Operating Segments [Member] | Commercial Networks [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues 84,726 126,977 251,746 336,563
Operating Segments [Member] | Commercial Networks [Member] | Product [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues 73,182 115,409 212,226 304,732
Operating Segments [Member] | Commercial Networks [Member] | Service [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues 11,544 11,568 39,520 31,831
Operating Segments [Member] | Government Systems [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues 291,798 250,066 851,539 680,300
Operating Segments [Member] | Government Systems [Member] | Product [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues 229,908 186,456 661,309 495,697
Operating Segments [Member] | Government Systems [Member] | Service [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues $ 61,890 $ 63,610 $ 190,230 $ 184,603