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Segment Information - Segment Revenues and Operating Profits (Losses) (Parenthetical) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Product revenues | $ 755,547 | $ 713,936 | $ 664,821
Income (loss) from operations | (92,187) | $ 36,459 | $ 41,119
TrellisWare [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Minority interest ownership percentage by parent |  | 52.00% | 52.00%
Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Income (loss) from operations | (79,956) | $ 47,247 | $ 57,557
Operating Segments [Member] | Satellite Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Product revenues | 664 | 27,711 | 25,606
Income (loss) from operations | 12,018 | 131,085 | 81,830
Operating Segments [Member] | Government Systems [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Product revenues | 556,849 | 474,767 | 410,521
Income (loss) from operations | $ 137,131 | 96,658 | 87,066
Uncharacterized damages and penalties |  | 11,800 |
Operating Segments [Member] | Implied License [Member] | Satellite Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Product revenues |  | 26,800 | 25,300
Income (loss) from operations |  | $ 26,800 | $ 25,300

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- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349 + Details
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