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Segments of Business (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Jun. 29, 2012
Jul. 01, 2011
Jun. 29, 2012
Jul. 01, 2011
Sep. 30, 2011
Net sales $ 128,595 $ 122,481 $ 337,497 $ 330,045  
Net sales 128,595 122,481 337,497 330,045  
Operating profit (loss) 14,222 11,810 24,484 21,899  
Total assets 274,908 257,997 274,908 257,997 259,356
Marine Electronics [Member]
          
Interunit transfers 100 83 193 242  
Operating profit (loss) 12,165 8,994 26,555 22,194  
Unaffiliated customers 70,123 64,089 198,057 185,774  
Total assets 108,692 99,035 108,692 99,035 101,739
Outdoor Equipment [Member]
          
Interunit transfers 25 16 55 42  
Operating profit (loss) 1,522 1,597 2,101 3,750  
Unaffiliated customers 12,197 11,306 27,894 32,017  
Total assets 22,967 23,175 22,967 23,175 24,046
Watercraft [Member]
          
Interunit transfers 56 112 79 126  
Operating profit (loss) 506 1,061 1,109 (14)  
Unaffiliated customers 22,109 21,743 46,631 45,980  
Total assets 44,260 45,031 44,260 45,031 34,614
Diving [Member]
          
Interunit transfers 93 301 398 670  
Operating profit (loss) 2,631 2,179 4,239 3,323  
Unaffiliated customers 23,958 25,099 64,509 65,841  
Total assets 71,339 75,676 71,339 75,676 67,969
Corporate and Other [Member]
          
Operating profit (loss) (2,602) (2,021) (9,520) (7,354)  
Unaffiliated customers 208 244 406 433  
Total assets 27,650 15,080 27,650 15,080 30,988
Intersegment Elimination [Member]
          
Interunit transfers $ (274) $ (512) $ (725) $ (1,080)