Segment Information (Details) (USD $) In Thousands	3 Months Ended
Jul. 01, 2011	Jul. 02, 2010	Apr. 01, 2011
Revenues
Elimination of intersegment revenues	$ 0	$ 0
Total revenues	195,101	192,004
Operating profits (losses)
Elimination of intersegment operating profits	0	0
Segment operating profit before corporate and amortization of acquired intangible assets	6,073	11,949
Amortization of acquired intangible assets	(4,772)	(4,610)
Income from operations	1,301	7,383
Segment assets
Total segment assets	461,915		455,209
Total assets	1,414,245		1,405,748
Government Systems [Member]
Revenues
Segment operating revenues	86,169	88,845
Operating profits (losses)
Segment operating profit	7,380	1,658
Amortization of acquired intangible assets	(651)	(269)
Segment assets
Segment assets	225,948		228,194
Commercial Networks [Member]
Revenues
Segment operating revenues	52,069	45,619
Operating profits (losses)
Segment operating profit	(3,240)	(1,170)
Amortization of acquired intangible assets	(883)	(1,103)
Segment assets
Segment assets	141,310		133,158
Satellite Services [Member]
Revenues
Segment operating revenues	56,863	57,540
Operating profits (losses)
Segment operating profit	1,933	11,461
Amortization of acquired intangible assets	(3,238)	(3,238)
Segment assets
Segment assets	94,657		93,857
Unallocated Amount to Segment [Member]
Operating profits (losses)
Corporate	0	44
Segment assets
Corporate assets	$ 952,330		$ 950,539

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Concepts (CON)
-Number 6
-Paragraph 25

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
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-Paragraph 18
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation S-X (SX)
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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of total assets attributed to the reportable segment.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of revenue from transactions with other operating segments of the same entity. Must be disclosed if the amount (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss

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Amount of total revenue for the reportable segment, including revenue from external customers, transactions with other operating segments of the same entity, and (gross) interest revenue. All considered to be "operating revenue" for purposes of the taxonomy.

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Total of reconciling items between total reportable segments' assets and consolidated entity assets.

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Total assets for reportable segments.

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The total amount of profit or loss for reportable segments.

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Elimination of items resulting from intersegment transactions (e.g., intersegment profits).

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Amount of income or loss for the reportable segment before corporate, amortization of intangibles acquired in business combination, unusual items, equity method income or loss, income taxes, and extraordinary items.

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Corporate headquarter profit (loss) not allocated to segments. Reconciliation of the total of reportable segments' amounts of measures of profits or loss to the consolidated amount.

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