Segment Information - Segment Revenues and Operating Profits (Losses) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Revenues:
Total revenues	$ 1,126,460	$ 779,791
Operating profits (losses):
Income (loss) from operations	59,735	(41,516)
Amortization of acquired intangible assets	(66,215)	(27,811)
Product [Member]
Revenues:
Total revenues	305,739	236,372
Service [Member]
Revenues:
Total revenues	820,721	543,419
Operating Segments [Member]
Operating profits (losses):
Income (loss) from operations	125,950	(13,705)
Operating Segments [Member] | Communication Services [Member]
Revenues:
Total revenues	826,787	560,260
Operating profits (losses):
Income (loss) from operations	41,939	(9,943)
Operating Segments [Member] | Communication Services [Member] | Government Satcom Services [Member]
Revenues:
Total revenues	183,873	82,624
Operating Segments [Member] | Communication Services [Member] | Aviation Services [Member]
Revenues:
Total revenues	257,155	151,112
Operating Segments [Member] | Communication Services [Member] | Maritime Services [Member]
Revenues:
Total revenues	123,947	45,345
Operating Segments [Member] | Communication Services [Member] | Fixed Services and Other Services [Member]
Revenues:
Total revenues	201,636	214,692
Operating Segments [Member] | Communication Services [Member] | Product [Member]
Revenues:
Total revenues	60,176	66,487
Operating Segments [Member] | Communication Services [Member] | Service [Member]
Revenues:
Total revenues	766,611	493,773
Operating Segments [Member] | Defense and Advanced Technologies [Member]
Revenues:
Total revenues	299,673	219,531
Operating profits (losses):
Income (loss) from operations	84,011	(3,762)
Operating Segments [Member] | Defense and Advanced Technologies [Member] | Information Security and Cyber Defense Products [Member]
Revenues:
Total revenues	55,507	56,676
Operating Segments [Member] | Defense and Advanced Technologies [Member] | Space and Mission Systems Products [Member]
Revenues:
Total revenues	73,306	72,387
Operating Segments [Member] | Defense and Advanced Technologies [Member] | Tactical Networking Products [Member]
Revenues:
Total revenues	71,410	37,384
Operating Segments [Member] | Defense and Advanced Technologies [Member] | Advanced Technologies and Other Products [Member]
Revenues:
Total revenues	45,340	3,438
Operating Segments [Member] | Defense and Advanced Technologies [Member] | Product [Member]
Revenues:
Total revenues	245,563	169,885
Operating Segments [Member] | Defense and Advanced Technologies [Member] | Service [Member]
Revenues:
Total revenues	54,110	49,646
Material Reconciling Items [Member]
Operating profits (losses):
Amortization of acquired intangible assets	$ (66,215)	$ (27,811)