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Segment Information - Segment Assets (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Mar. 31, 2021
--- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | $ 5,994,533 | $ 5,349,467
Operating Segments [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 1,156,993 | 702,771
Operating Segments [Member] | Satellite Services [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 449,976 | 64,048
Operating Segments [Member] | Commercial Networks [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 235,575 | 168,334
Operating Segments [Member] | Government Systems [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 471,442 | 470,389
Corporate, Non-Segment [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | $ 4,837,540 | $ 4,646,696

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