Segment Information - Segment Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Apr. 03, 2015
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 2,245,799	$ 2,158,378
Operating Segments [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	585,872	554,371
Operating Segments [Member] | Satellite Services [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	66,382	63,790
Operating Segments [Member] | Commercial Networks [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	234,527	217,268
Operating Segments [Member] | Government Systems [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	284,963	273,313
Corporate, Non-Segment [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 1,659,927	$ 1,604,007