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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, 2021 | Dec. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | $ 719,717 | $ 575,559 | $ 2,085,931 | $ 1,660,325
Product [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | 316,143 | 266,514 | 918,073 | 773,128
Service [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | 403,574 | 309,045 | 1,167,858 | 887,197
Operating Segments [Member] | Satellite Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | 309,711 | 220,789 | 883,938 | 638,660
Operating Segments [Member] | Satellite Services [Member] | Service [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | 309,711 | 220,789 | 883,938 | 638,660
Operating Segments [Member] | Commercial Networks [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | 139,677 | 90,099 | 393,079 | 236,121
Operating Segments [Member] | Commercial Networks [Member] | Product [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | 123,059 | 75,690 | 343,525 | 197,560
Operating Segments [Member] | Commercial Networks [Member] | Service [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | 16,618 | 14,409 | 49,554 | 38,561
Operating Segments [Member] | Government Systems [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | 270,329 | 264,671 | 808,914 | 785,544
Operating Segments [Member] | Government Systems [Member] | Product [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | 193,084 | 190,824 | 574,548 | 575,568
Operating Segments [Member] | Government Systems [Member] | Service [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | $ 77,245 | $ 73,847 | $ 234,366 | $ 209,976

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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 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599 Reference 6: 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=123351226&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9054-108599 Reference 10: 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=123351226&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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