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Segment Information - Segment Revenues and Operating Profits (Losses) (Detail) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Revenues:    
Total revenues $ 537,037 $ 438,869
Operating profits (losses):    
Operating profits (losses) (8,065) (54,479)
Amortization of acquired intangible assets (2,037) (2,453)
Product [Member]    
Revenues:    
Total revenues 263,615 218,129
Service [Member]    
Revenues:    
Total revenues 273,422 220,740
Operating Segments [Member]    
Operating profits (losses):    
Operating profits (losses) (6,028) (52,026)
Operating Segments [Member] | Satellite Services [Member]    
Revenues:    
Total revenues 196,815 153,561
Operating profits (losses):    
Operating profits (losses) (2,070) (29,936)
Amortization of acquired intangible assets (855) (1,305)
Operating Segments [Member] | Satellite Services [Member] | Service [Member]    
Revenues:    
Total revenues 196,815 153,561
Operating Segments [Member] | Commercial Networks [Member]    
Revenues:    
Total revenues 79,012 95,066
Operating profits (losses):    
Operating profits (losses) (49,861) (47,008)
Amortization of acquired intangible assets (386) (385)
Operating Segments [Member] | Commercial Networks [Member] | Product [Member]    
Revenues:    
Total revenues 64,901 85,133
Operating Segments [Member] | Commercial Networks [Member] | Service [Member]    
Revenues:    
Total revenues 14,111 9,933
Operating Segments [Member] | Government Systems [Member]    
Revenues:    
Total revenues 261,210 190,242
Operating profits (losses):    
Operating profits (losses) 45,903 24,918
Amortization of acquired intangible assets (796) (763)
Operating Segments [Member] | Government Systems [Member] | Product [Member]    
Revenues:    
Total revenues 198,714 132,996
Operating Segments [Member] | Government Systems [Member] | Service [Member]    
Revenues:    
Total revenues 62,496 57,246
Material Reconciling Items [Member]    
Operating profits (losses):    
Amortization of acquired intangible assets $ (2,037) $ (2,453)