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Investments in Equity Securities (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 29, 2018 | Jun. 29, 2018 | Oct. 22, 2014 | Sep. 02, 2014
Vislink plc [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  | 3.30%
Cost Method Investments Original Cost |  |  |  | $ 3.3
Pebble Beach Systems [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Gain on Change in Fair Value of Cost Investment | $ 0.2 | $ 0.2 |  |
Variable Interest Entity, Not Primary Beneficiary [Member] | EDC [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  | 18.40% |
Cost Method Investments Original Cost |  |  | $ 3.5 |
Cost-method Investments, Other than Temporary Impairment |  | $ 0.0 |  |

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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the cost method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75025870&loc=d3e40691-111596 + Details
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- Definition The aggregate net change in the difference between the fair value and the carrying value, or in the comparative fair values, of marketable securities categorized as trading held at each balance sheet date, that was included in earnings for the period, which may have arisen from (a) securities classified as trading, (b) the unrealized holding gain (loss) on held-to-maturity securities transferred to the trading security category, and (c) the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) on available-for-sale securities transferred to trading securities during the period and/or any unrealized gains or losses on investments that are separately or otherwise not categorized as trading or available-for-sale. + References No definition available. + Details
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