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Condensed Consolidated Statements Of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Dec. 28, 2012
Dec. 30, 2011
Net sales $ 87,274 $ 80,176
Cost of sales 53,460 49,075
Gross profit 33,814 31,101
Operating expenses:    
Marketing and selling 19,218 20,385
Administrative management, finance and information systems 9,445 10,838
Research and development 3,625 3,597
Total operating expenses 32,288 34,820
Operating profit (loss) 1,526 (3,719)
Interest income (21) (21)
Interest expense 439 596
Other expense (income), net 498 (1,192)
Income (loss) before income taxes 610 (3,102)
Income tax expense (benefit) 363 (158)
Net income (loss) $ 247 $ (2,944)
Participating securities   480
Dilutive stock options 4  
Weighted average common shares - Dilutive 9,439 9,807
Class A [Member]
    
Weighted average common shares - Basic:    
Weighted average common shares - Basic 8,221 8,111
Net income per common share - Basic:    
Net income (loss) per common share - Basic $ 0.03 $ (0.30)
Net income per common share - Diluted:    
Net income (loss) per common share - Diluted $ 0.02 $ (0.30)
Class B [Member]
    
Weighted average common shares - Basic:    
Weighted average common shares - Basic 1,214 1,216
Net income per common share - Basic:    
Net income (loss) per common share - Basic $ 0.02 $ (0.30)
Net income per common share - Diluted:    
Net income (loss) per common share - Diluted $ 0.02 $ (0.30)