Segment Information - Segment Assets (Detail) - USD ($) $ in Thousands |
Mar. 31, 2018 |
Mar. 31, 2017 |
Mar. 31, 2016 |
---|---|---|---|
Segment Reporting, Asset Reconciling Item [Line Items] | |||
Total assets | $ 3,414,109 | $ 2,954,653 | $ 2,397,312 |
Operating Segments [Member] | |||
Segment Reporting, Asset Reconciling Item [Line Items] | |||
Total assets | 615,728 | 587,962 | 582,399 |
Operating Segments [Member] | Satellite Services [Member] | |||
Segment Reporting, Asset Reconciling Item [Line Items] | |||
Total assets | 66,830 | 81,728 | 57,529 |
Operating Segments [Member] | Commercial Networks [Member] | |||
Segment Reporting, Asset Reconciling Item [Line Items] | |||
Total assets | 211,447 | 179,992 | 212,943 |
Operating Segments [Member] | Government Systems [Member] | |||
Segment Reporting, Asset Reconciling Item [Line Items] | |||
Total assets | 337,451 | 326,242 | 311,927 |
Corporate, Non-Segment [Member] | |||
Segment Reporting, Asset Reconciling Item [Line Items] | |||
Total assets | $ 2,798,381 | $ 2,366,691 | $ 1,814,913 |