Segment Information (Details 2) (USD $) In Thousands	3 Months Ended
Jul. 01, 2011	Jul. 02, 2010
Amortization of acquired intangibles by segment
Amortization of acquired intangible assets	$ 4,772	$ 4,610
Government Systems [Member]
Amortization of acquired intangibles by segment
Amortization of acquired intangible assets	651	269
Commercial Networks [Member]
Amortization of acquired intangibles by segment
Amortization of acquired intangible assets	883	1,103
Satellite Services [Member]
Amortization of acquired intangibles by segment
Amortization of acquired intangible assets	$ 3,238	$ 3,238

Aggregate amount of amortization expense recognized for intangible asset during the period. A recognized intangible asset shall be amortized over its estimated useful life to the reporting entity unless that life is determined to be indefinite. If an intangible asset has a finite useful life, but the precise length of that life is not known, that intangible asset shall be amortized over the best estimate of its useful life.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph a(2)

Name:	us-gaap_FiniteLivedIntangibleAssetsAmortizationExpense
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration