Segment Information - Segment Revenues, Operating Profits (Losses) and Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 28, 2012	Dec. 30, 2011	Dec. 28, 2012	Dec. 30, 2011	Mar. 30, 2012
Revenues
Product revenues	$ 164,694	$ 121,862	$ 480,898	$ 391,019
Service revenues	121,748	83,102	330,129	232,070
Total revenues	286,442	204,964	811,027	623,089
Operating (losses) profits
Amortization of acquired intangible assets	(3,960)	(4,752)	(12,065)	(14,291)
(Loss) income from operations	1,266	1,792	(13,382)	8,049
Total assets	1,748,935		1,748,935		1,727,153
Satellite Services [Member]
Revenues
Product revenues	653	734	4,159	2,312
Service revenues	71,097	54,916	194,217	165,616
Total revenues	71,750	55,650	198,376	167,928
Operating (losses) profits
Amortization of acquired intangible assets	(3,159)	(3,238)	(9,635)	(9,714)
(Loss) income from operations	(18,356)	(1,359)	(60,245)	(1,165)
Total assets	94,089		94,089		95,671
Commercial Networks [Member]
Revenues
Product revenues	64,241	49,092	216,116	155,451
Service revenues	4,411	5,357	15,208	15,266
Total revenues	68,652	54,449	231,324	170,717
Operating (losses) profits
Amortization of acquired intangible assets	(163)	(883)	(523)	(2,650)
(Loss) income from operations	(3,399)	(5,159)	(7,304)	(11,270)
Total assets	183,186		183,186		170,553
Government Systems [Member]
Revenues
Product revenues	99,800	72,036	260,623	233,256
Service revenues	46,240	22,829	120,704	51,188
Total revenues	146,040	94,865	381,327	284,444
Operating (losses) profits
Amortization of acquired intangible assets	(638)	(631)	(1,907)	(1,927)
(Loss) income from operations	26,981	13,062	66,232	34,775
Total assets	221,782		221,782		219,199
Elimination of intersegment revenues [Member]
Revenues
Total revenues	0	0	0	0
Operating (losses) profits
(Loss) income from operations	0	0	0	0
Operating Segments [Member]
Operating (losses) profits
(Loss) income from operations	5,226	6,544	(1,317)	22,340
Total assets	499,057		499,057		485,423
Unallocated Amount to Segment [Member]
Operating (losses) profits
(Loss) income from operations	0	0	0	0
Total assets	$ 1,249,878		$ 1,249,878		$ 1,241,730