Segment Information - Segment Revenues and Operating Profits (Losses) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Oct. 03, 2014	Sep. 30, 2015	Oct. 03, 2014
Revenues:
Product revenues	$ 163,660	$ 193,924	$ 332,008	$ 362,053
Service revenues	189,670	164,834	365,700	316,176
Total revenues	353,330	358,758	697,708	678,229
Operating profits (losses):
Income (loss) from operations	13,826	46,456	23,240	45,287
Amortization of acquired intangible assets	(4,587)	(4,658)	(9,397)	(8,687)
Satellite Services [Member]
Operating profits (losses):
Amortization of acquired intangible assets	(2,765)	(2,765)	(5,530)	(5,530)
Commercial Networks [Member]
Operating profits (losses):
Amortization of acquired intangible assets	(755)	(373)	(1,251)	(715)
Government Systems [Member]
Operating profits (losses):
Amortization of acquired intangible assets	(1,067)	(1,520)	(2,616)	(2,442)
Operating Segments [Member]
Operating profits (losses):
Income (loss) from operations	18,413	51,114	32,637	53,974
Operating Segments [Member] | Satellite Services [Member]
Revenues:
Product revenues	6,376	21,289	12,652	21,319
Service revenues	133,809	114,647	259,949	224,332
Total revenues	140,185	135,936	272,601	245,651
Operating profits (losses):
Income (loss) from operations	21,036	39,351	38,077	37,402
Operating Segments [Member] | Commercial Networks [Member]
Revenues:
Product revenues	61,983	83,109	123,494	171,701
Service revenues	4,387	3,750	9,631	7,386
Total revenues	66,370	86,859	133,125	179,087
Operating profits (losses):
Income (loss) from operations	(22,306)	(7,253)	(41,039)	(13,243)
Operating Segments [Member] | Government Systems [Member]
Revenues:
Product revenues	95,301	89,526	195,862	169,033
Service revenues	51,474	46,437	96,120	84,458
Total revenues	146,775	135,963	291,982	253,491
Operating profits (losses):
Income (loss) from operations	19,683	19,016	35,599	29,815
Material Reconciling Items [Member]
Operating profits (losses):
Amortization of acquired intangible assets	$ (4,587)	$ (4,658)	$ (9,397)	$ (8,687)