Segment Information - Segment Revenues, Operating (Losses) Profits and Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 03, 2014	Oct. 04, 2013	Oct. 03, 2014	Oct. 04, 2013	Apr. 04, 2014
Revenues:
Product revenues	$ 193,924	$ 210,391	$ 362,053	$ 392,552
Service revenues	164,834	143,490	316,176	282,431
Total revenues	358,758	353,881	678,229	674,983
Operating profits (losses):
Amortization of acquired intangible assets	(4,658)	(3,796)	(8,687)	(7,297)
Income (loss) from operations	46,456	(510)	45,287	2,914
Assets
Total assets	2,014,764		2,014,764		1,960,115
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	(373)	(509)	(715)	(652)
Government Systems [Member]
Operating profits (losses):
Amortization of acquired intangible assets	(1,520)	(522)	(2,442)	(1,115)
Operating Segments [Member]
Operating profits (losses):
Income (loss) from operations	51,114	3,286	53,974	10,211
Assets
Total assets	575,152		575,152		509,685
Operating Segments [Member] | Satellite Services [Member]
Revenues:
Product revenues	21,289	4	21,319	20
Service revenues	114,647	100,347	224,332	186,178
Total revenues	135,936	100,351	245,651	186,198
Operating profits (losses):
Income (loss) from operations	39,351	(14,638)	37,402	(27,616)
Assets
Total assets	76,906		76,906		73,382
Operating Segments [Member] | Commercial Networks [Member]
Revenues:
Product revenues	83,109	105,146	171,701	196,970
Service revenues	3,750	5,041	7,386	10,616
Total revenues	86,859	110,187	179,087	207,586
Operating profits (losses):
Income (loss) from operations	(7,253)	(366)	(13,243)	2,970
Assets
Total assets	242,278		242,278		229,455
Operating Segments [Member] | Government Systems [Member]
Revenues:
Product revenues	89,526	105,241	169,033	195,562
Service revenues	46,437	38,102	84,458	85,637
Total revenues	135,963	143,343	253,491	281,199
Operating profits (losses):
Income (loss) from operations	19,016	18,290	29,815	34,857
Assets
Total assets	255,968		255,968		206,848
Corporate, Non-Segment [Member]
Operating profits (losses):
Income (loss) from operations
Assets
Total assets	1,439,612		1,439,612		1,450,430
Intersegment Elimination [Member]
Revenues:
Total revenues
Operating profits (losses):
Income (loss) from operations
Material Reconciling Items [Member]
Operating profits (losses):
Amortization of acquired intangible assets	$ (4,658)	$ (3,796)	$ (8,687)	$ (7,297)