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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