Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 30, 2011	Dec. 31, 2010	Dec. 30, 2011	Dec. 31, 2010	Apr. 01, 2011
Revenues
Product revenues	$ 121,862	$ 126,434	$ 391,019	$ 379,022
Service revenues	83,102	69,507	232,070	206,812
Total revenues	204,964	195,941	623,089	585,834
Operating profits (losses)
Amortization of acquired intangible assets	(4,752)	(4,923)	(14,291)	(14,627)
Income (loss) from operations	1,792	7,012	8,049	27,468
Assets
Total Assets	1,579,663		1,579,663		1,405,748
Government Systems [Member]
Revenues
Product revenues	72,036	89,640	233,256	258,002
Service revenues	22,829	7,921	51,188	23,341
Total revenues	94,865	97,561	284,444	281,343
Operating profits (losses)
Amortization of acquired intangible assets	(631)	(714)	(1,927)	(1,806)
Income (loss) from operations	13,062	8,166	34,775	22,632
Assets
Total Assets	225,226		225,226		228,194
Commercial Networks [Member]
Revenues
Product revenues	49,092	34,849	155,451	116,898
Service revenues	5,357	4,199	15,266	12,081
Total revenues	54,449	39,048	170,717	128,979
Operating profits (losses)
Amortization of acquired intangible assets	(883)	(971)	(2,650)	(3,107)
Income (loss) from operations	(5,159)	(4,160)	(11,270)	(7,677)
Assets
Total Assets	143,394		143,394		133,158
Satellite Services [Member]
Revenues
Product revenues	734	1,945	2,312	4,122
Service revenues	54,916	57,387	165,616	171,390
Total revenues	55,650	59,332	167,928	175,512
Operating profits (losses)
Amortization of acquired intangible assets	(3,238)	(3,238)	(9,714)	(9,714)
Income (loss) from operations	(1,359)	7,929	(1,165)	27,096
Assets
Total Assets	95,325		95,325		93,857
Unallocated Amount to Segment [Member]
Operating profits (losses)
Income (loss) from operations	0	0	0	44
Assets
Total Assets	1,115,718		1,115,718		950,539
Operating Segments [Member]
Operating profits (losses)
Income (loss) from operations	6,544	11,935	22,340	42,051
Assets
Total Assets	463,945		463,945		455,209
Intersegment Elimination [Member]
Revenues
Total revenues	0	0	0	0
Operating profits (losses)
Income (loss) from operations	$ 0	$ 0	$ 0	$ 0