Segment Information - Segment Revenues, Operating Profits (Losses) and Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 28, 2012	Sep. 30, 2011	Sep. 28, 2012	Sep. 30, 2011	Mar. 30, 2012
Revenues
Product revenues	$ 168,475	$ 146,611	$ 316,204	$ 269,157
Service revenues	114,347	76,413	208,381	148,968
Total revenues	282,822	223,024	524,585	418,125
Operating (losses) profits
Amortization of acquired intangible assets	(4,041)	(4,767)	(8,105)	(9,539)
(Loss) income from operations	(859)	4,956	(14,648)	6,257
Total assets	1,743,369		1,743,369		1,727,153
Satellite Services [Member]
Revenues
Product revenues	2,975	927	3,506	1,578
Service revenues	64,332	54,488	123,120	110,700
Total revenues	67,307	55,415	126,626	112,278
Operating (losses) profits
Amortization of acquired intangible assets	(3,238)	(3,238)	(6,476)	(6,476)
(Loss) income from operations	(19,373)	(1,739)	(41,889)	194
Total assets	98,269		98,269		95,671
Commercial Networks [Member]
Revenues
Product revenues	81,113	59,063	151,875	106,359
Service revenues	5,424	5,136	10,797	9,909
Total revenues	86,537	64,199	162,672	116,268
Operating (losses) profits
Amortization of acquired intangible assets	(177)	(884)	(361)	(1,767)
(Loss) income from operations	(1,836)	(2,871)	(3,905)	(6,111)
Total assets	182,458		182,458		170,553
Government Systems [Member]
Revenues
Product revenues	84,387	86,621	160,823	161,220
Service revenues	44,591	16,789	74,464	28,359
Total revenues	128,978	103,410	235,287	189,579
Operating (losses) profits
Amortization of acquired intangible assets	(626)	(645)	(1,268)	(1,296)
(Loss) income from operations	24,391	14,333	39,251	21,713
Total assets	222,497		222,497		219,199
Intersegment Elimination [Member]
Revenues
Total revenues
Operating (losses) profits
(Loss) income from operations
Operating Segments [Member]
Operating (losses) profits
(Loss) income from operations	3,182	9,723	(6,543)	15,796
Total assets	503,224		503,224		485,423
Unallocated Amount to Segment [Member]
Operating (losses) profits
(Loss) income from operations
Total assets	$ 1,240,145		$ 1,240,145		$ 1,241,730