Segment Information - Segment Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 7,730,337	$ 6,389,346
Assets of discontinued operations		275,102
Operating Segments [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,047,489	914,558
Operating Segments [Member] | Satellite Services [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	424,881	444,976
Operating Segments [Member] | Commercial Networks [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	328,828	202,941
Operating Segments [Member] | Government Systems [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	293,780	266,641
Corporate, Non-Segment [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 6,682,848	$ 5,199,686