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The Company and a Summary of Its Significant Accounting Policies - Summary of Disaggregation of Revenue by Segment and Product and Services (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Disaggregation Of Revenue [Line Items] |  |  |
Total revenues | $ 2,068,258 | $ 1,594,625 | $ 1,559,337
Product [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenues | 1,092,691 | 755,547 | 713,936
Service [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenues | 975,567 | 839,078 | 845,401
Operating Segments [Member] | Satellite Services [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenues | 684,205 | 589,287 | 629,647
Operating Segments [Member] | Satellite Services [Member] | Product [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenues |  | 664 | 27,711
Operating Segments [Member] | Satellite Services [Member] | Service [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenues | 684,205 | 588,623 | 601,936
Operating Segments [Member] | Commercial Networks [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenues | 428,404 | 233,221 | 244,607
Operating Segments [Member] | Commercial Networks [Member] | Product [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenues | 383,547 | 198,034 | 211,458
Operating Segments [Member] | Commercial Networks [Member] | Service [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenues | 44,857 | 35,187 | 33,149
Operating Segments [Member] | Government Systems [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenues | 955,649 | 772,117 | 685,083
Operating Segments [Member] | Government Systems [Member] | Product [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenues | 709,144 | 556,849 | 474,767
Operating Segments [Member] | Government Systems [Member] | Service [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenues | $ 246,505 | $ 215,268 | $ 210,316

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