Segment Information - Segment Revenues, Operating Profits (Losses) and Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 04, 2013	Sep. 28, 2012	Oct. 04, 2013	Sep. 28, 2012	Mar. 29, 2013
Revenues:
Product revenues	$ 210,391	$ 168,475	$ 392,552	$ 316,204
Service revenues	143,490	114,347	282,431	208,381
Total revenues	353,881	282,822	674,983	524,585
Operating profits (losses):
Amortization of acquired intangible assets	(3,796)	(4,041)	(7,297)	(8,105)
(Loss) income from operations	(510)	(859)	2,914	(14,648)
Assets
Total assets	1,899,553		1,899,553		1,794,072
Satellite Services [Member]
Operating profits (losses):
Amortization of acquired intangible assets	(2,765)	(3,238)	(5,530)	(6,476)
Commercial Networks [Member]
Operating profits (losses):
Amortization of acquired intangible assets	(509)	(177)	(652)	(361)
Government Systems [Member]
Operating profits (losses):
Amortization of acquired intangible assets	(522)	(626)	(1,115)	(1,268)
Operating Segments [Member]
Operating profits (losses):
(Loss) income from operations	3,286	3,182	10,211	(6,543)
Assets
Total assets	526,206		526,206		503,232
Operating Segments [Member] | Satellite Services [Member]
Revenues:
Product revenues	4	2,975	20	3,506
Service revenues	100,347	64,332	186,178	123,120
Total revenues	100,351	67,307	186,198	126,626
Operating profits (losses):
(Loss) income from operations	(14,638)	(19,373)	(27,616)	(41,889)
Assets
Total assets	82,928		82,928		89,945
Operating Segments [Member] | Commercial Networks [Member]
Revenues:
Product revenues	105,146	81,113	196,970	151,875
Service revenues	5,041	5,424	10,616	10,797
Total revenues	110,187	86,537	207,586	162,672
Operating profits (losses):
(Loss) income from operations	(366)	(1,836)	2,970	(3,905)
Assets
Total assets	236,538		236,538		175,230
Operating Segments [Member] | Government Systems [Member]
Revenues:
Product revenues	105,241	84,387	195,562	160,823
Service revenues	38,102	44,591	85,637	74,464
Total revenues	143,343	128,978	281,199	235,287
Operating profits (losses):
(Loss) income from operations	18,290	24,391	34,857	39,251
Assets
Total assets	206,740		206,740		238,057
Intersegment Elimination [Member]
Revenues:
Total revenues
Operating profits (losses):
(Loss) income from operations
Corporate, Non-Segment [Member]
Operating profits (losses):
(Loss) income from operations
Assets
Total assets	1,373,347		1,373,347		1,290,840
Material Reconciling Items [Member]
Operating profits (losses):
Amortization of acquired intangible assets	$ (3,796)	$ (4,041)	$ (7,297)	$ (8,105)