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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, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 187,235 | $ 163,660 | $ 347,911 | $ 332,008
Income (loss) from operations | 18,414 | 13,826 | 26,192 | 23,240
Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income (loss) from operations | 20,691 | 18,413 | 30,982 | 32,637
Operating Segments [Member] | Satellite Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | 6,782 | 6,376 | 13,467 | 12,652
Income (loss) from operations | 32,550 | 21,036 | 63,417 | 38,077
Operating Segments [Member] | Implied License [Member] | Satellite Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | 6,600 | 6,300 | 13,200 | 12,500
Income (loss) from operations | $ 6,600 | $ 6,300 | $ 13,200 | $ 12,500

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