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Segment Information - Segment Revenues and Operating Profits (Losses) (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 175,957 | $ 169,574 | $ 523,858 | $ 517,485
Income (loss) from operations | (25,326) | 7,591 | (59,136) | 33,783
Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income (loss) from operations | (22,149) | 10,366 | (49,379) | 41,348
Operating Segments [Member] | Satellite Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | 233 | 7,114 | 664 | 20,581
Income (loss) from operations | $ 1,681 | 34,846 | $ 33,140 | 98,263
Operating Segments [Member] | Implied License [Member] | Satellite Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues |  | 6,800 |  | 20,000
Income (loss) from operations |  | $ 6,800 |  | $ 20,000

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