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Segment Information - Segment Assets (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Mar. 31, 2017
--- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | $ 3,288,221 | $ 2,954,653
Operating Segments [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 589,264 | 587,962
Operating Segments [Member] | Satellite Services [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 74,234 | 81,728
Operating Segments [Member] | Commercial Networks [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 192,563 | 179,992
Operating Segments [Member] | Government Systems [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 322,467 | 326,242
Corporate, Non-Segment [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | $ 2,698,957 | $ 2,366,691

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