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Fair Value Measurements (Narrative) (Details) (USD $) In Thousands, unless otherwise specified |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 28, 2012 Trademarks [Member] | Sep. 30, 2011 Trademarks [Member] | Sep. 28, 2012 Marine Electronics [Member] Trademarks [Member] | Sep. 30, 2011 Ferndale, Washington Facility [Member] | Oct. 01, 2010 Casarza-Ligure, Italy Facility [Member] | Mar. 31, 2010 Casarza-Ligure, Italy Facility [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Fair Value of Intangible Assets, Finite-lived | $ 3 | $ 882 | $ 0 |  |  |
Impairment of Intangible Assets, Finite-lived |  |  | 609 | 334 | 114 |
Impairment Charge of Facility |  |  |  | 334 |  |
Fair Value of Facility |  |  |  | 1,300 | 656 |
Long-Lived Assets, Sold Price |  |  |  |  |  | $ 634

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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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