Goodwill and Acquired Intangible Assets - Schedule of Goodwill by Segments (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Mar. 31, 2025
Goodwill [Line Items]
Goodwill	$ 1,626,078	$ 1,622,132
Communication Services [Member]
Goodwill [Line Items]
Goodwill	1,585,542	1,582,083
Defense and Advanced Technologies [Member]
Goodwill [Line Items]
Goodwill	$ 40,536	$ 40,049