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Segment Information - Segment Assets (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Mar. 31, 2018
--- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | $ 3,544,268 | $ 3,414,109
Operating Segments [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 607,461 | 615,728
Operating Segments [Member] | Satellite Services [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 73,919 | 66,830
Operating Segments [Member] | Commercial Networks [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 214,942 | 211,447
Operating Segments [Member] | Government Systems [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 318,600 | 337,451
Corporate, Non-Segment [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | $ 2,936,807 | $ 2,798,381

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