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Summary Of Significant Accounting Policies (Impairment Of Long-Lived Assets) (Narrative) (Details) (USD $) In Thousands, unless otherwise specified		12 Months Ended
	Sep. 28, 2012 Marine Electronics [Member]	Oct. 01, 2010 Casarza-Ligure, Italy Warehouse Facility [Member]	Sep. 30, 2011 Ferndale, Washington Facility [Member]
Impairment Of Long Lived Assets By Segment And Location [Line Items]
Impairment Charge of Facility		$ 114	$ 334
Fair Value of Facility		656	1,300
Fair Value of Geonav Trademark	0
Impairment Charge of Intangible Asset			$ 334

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This element represents the sum of all intangible assets having statutory or estimated useful lives.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software, net of accumulated depreciation.

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