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Segment Information - Segment Revenues and Operating Profits (Losses) (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 181,783 | $ 187,235 | $ 347,901 | $ 347,911
Income (loss) from operations | (15,860) | 18,414 | (33,810) | 26,192
Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income (loss) from operations | (12,540) | 20,691 | (27,230) | 30,982
Operating Segments [Member] | Satellite Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | 214 | 6,782 | 431 | 13,467
Income (loss) from operations | $ 12,616 | 32,550 | $ 31,459 | 63,417
Operating Segments [Member] | Implied License [Member] | Satellite Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues |  | 6,600 |  | 13,200
Income (loss) from operations |  | $ 6,600 |  | $ 13,200

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