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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 | 6 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | $ 517,474 | $ 393,074 | $ 956,343 | $ 773,118
Product [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | 280,435 | 181,783 | 498,564 | 347,901
Service [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | 237,039 | 211,291 | 457,779 | 425,217
Operating Segments [Member] | Satellite Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | 162,962 | 147,578 | 316,523 | 299,792
Operating Segments [Member] | Satellite Services [Member] | Product [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues |  | 214 |  | 431
Operating Segments [Member] | Satellite Services [Member] | Service [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | 162,962 | 147,364 | 316,523 | 299,361
Operating Segments [Member] | Commercial Networks [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | 114,520 | 56,269 | 209,586 | 101,517
Operating Segments [Member] | Commercial Networks [Member] | Product [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | 104,190 | 47,347 | 189,323 | 83,830
Operating Segments [Member] | Commercial Networks [Member] | Service [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | 10,330 | 8,922 | 20,263 | 17,687
Operating Segments [Member] | Government Systems [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | 239,992 | 189,227 | 430,234 | 371,809
Operating Segments [Member] | Government Systems [Member] | Product [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | 176,245 | 134,222 | 309,241 | 263,640
Operating Segments [Member] | Government Systems [Member] | Service [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | $ 63,747 | $ 55,005 | $ 120,993 | $ 108,169

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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