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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, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Disaggregation Of Revenue [Line Items] |  |  |
Total revenues | $ 2,309,238 | $ 2,068,258 | $ 1,594,625
Product [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenues | 1,172,541 | 1,092,691 | 755,547
Service [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenues | 1,136,697 | 975,567 | 839,078
Operating Segments [Member] | Satellite Services [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenues | 826,583 | 684,205 | 589,287
Operating Segments [Member] | Satellite Services [Member] | Product [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenues |  |  | 664
Operating Segments [Member] | Satellite Services [Member] | Service [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenues | 826,583 | 684,205 | 588,623
Operating Segments [Member] | Commercial Networks [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenues | 344,557 | 428,404 | 233,221
Operating Segments [Member] | Commercial Networks [Member] | Product [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenues | 289,959 | 383,547 | 198,034
Operating Segments [Member] | Commercial Networks [Member] | Service [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenues | 54,598 | 44,857 | 35,187
Operating Segments [Member] | Government Systems [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenues | 1,138,098 | 955,649 | 772,117
Operating Segments [Member] | Government Systems [Member] | Product [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenues | 882,582 | 709,144 | 556,849
Operating Segments [Member] | Government Systems [Member] | Service [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenues | $ 255,516 | $ 246,505 | $ 215,268

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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