Segment Information (Details 1) (USD $) In Thousands	Sep. 30, 2011	Apr. 01, 2011
Other net acquired intangible assets and goodwill included in segment assets
Other acquired intangible assets, net	$ 72,079	$ 81,889
Goodwill	83,345	83,532
Government Systems [Member]
Other net acquired intangible assets and goodwill included in segment assets
Other acquired intangible assets, net	9,580	11,157
Goodwill	29,777	30,023
Commercial Networks [Member]
Other net acquired intangible assets and goodwill included in segment assets
Other acquired intangible assets, net	3,634	5,391
Goodwill	43,759	43,700
Satellite Services [Member]
Other net acquired intangible assets and goodwill included in segment assets
Other acquired intangible assets, net	58,865	65,341
Goodwill	$ 9,809	$ 9,809