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Segment Information - Segment Assets (Detail) - USD ($) $ in Thousands | Mar. 31, 2020 | Apr. 01, 2019 | Mar. 31, 2019
--- | --- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | $ 4,883,868 | $ 4,242,149 | $ 3,915,287
Operating Segments [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 758,758 |  | 677,529
Operating Segments [Member] | Satellite Services [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 86,252 |  | 85,907
Operating Segments [Member] | Commercial Networks [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 188,269 |  | 183,200
Operating Segments [Member] | Government Systems [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 484,237 |  | 408,422
Corporate, Non-Segment [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | $ 4,125,110 |  | $ 3,237,758

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