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Condensed Consolidated Statements Of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 30, 2012
Apr. 01, 2011
Mar. 30, 2012
Apr. 01, 2011
Net sales $ 128,726 $ 128,864 $ 208,902 $ 207,564
Cost of sales 78,199 75,931 127,274 123,951
Gross profit 50,527 52,933 81,628 83,613
Operating expenses:        
Marketing and selling 25,281 27,500 45,666 46,808
Administrative management, finance and information systems 11,200 10,485 22,038 19,576
Litigation settlement recovery (3,500)   (3,500)  
Research and development 3,565 3,524 7,162 7,140
Total operating expenses 36,546 41,509 71,366 73,524
Operating profit 13,981 11,424 10,262 10,089
Interest income (10) (18) (31) (47)
Interest expense 817 1,011 1,413 1,864
Other (income) expense, net (104) 343 (1,296) 337
Income before income taxes 13,278 10,088 10,176 7,935
Income tax expense 5,995 1,602 5,837 686
Net income $ 7,283 $ 8,486 $ 4,339 $ 7,249
Dilutive stock options 4 29 11 36
Weighted average common shares - Dilutive 9,382 9,289 9,363 9,293
Class A [Member]
        
Weighted average common shares - Basic:        
Weighted average common shares - Basic 8,162 8,044 8,136 8,041
Net income per common share - Basic:        
Net income per common share - Basic $ 0.75 $ 0.89 $ 0.45 $ 0.76
Net income per common share - Diluted:        
Net income per common share - Diluted $ 0.74 $ 0.87 $ 0.44 $ 0.75
Class B [Member]
        
Weighted average common shares - Basic:        
Weighted average common shares - Basic 1,216 1,216 1,216 1,216
Net income per common share - Basic:        
Net income per common share - Basic $ 0.68 $ 0.80 $ 0.40 $ 0.69
Net income per common share - Diluted:        
Net income per common share - Diluted $ 0.74 $ 0.87 $ 0.44 $ 0.75