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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. 29, 2013
Mar. 30, 2012
Mar. 29, 2013
Mar. 30, 2012
Net sales $ 132,100 $ 128,726 $ 219,374 $ 208,902
Cost of sales 78,016 78,199 131,476 127,274
Gross profit 54,084 50,527 87,898 81,628
Operating expenses:        
Marketing and selling 25,876 25,281 45,094 45,666
Administrative management, finance and information systems 11,500 11,200 20,945 22,038
Litigation settlement recovery   (3,500)   (3,500)
Research and development 4,070 3,565 7,695 7,162
Total operating expenses 41,446 36,546 73,734 71,366
Operating profit 12,638 13,981 14,164 10,262
Interest income (32) (10) (53) (31)
Interest expense 485 817 924 1,413
Other expense (income), net (878) (104) (380) (1,296)
Income before income taxes 13,063 13,278 13,673 10,176
Income tax expense 4,126 5,995 4,489 5,837
Net income $ 8,937 $ 7,283 $ 9,184 $ 4,339
Dilutive stock options 4 4 3 11
Weighted average common shares - Dilutive 9,546 9,382 9,491 9,363
Class A [Member]
        
Weighted average common shares - Basic:        
Weighted average common shares - Basic 8,328 8,162 8,274 8,136
Net income per common share - Basic:        
Net income per common share - Basic $ 0.91 $ 0.75 $ 0.94 $ 0.45
Net income per common share - Diluted:        
Net income per common share - Diluted $ 0.90 $ 0.74 $ 0.93 $ 0.44
Class B [Member]
        
Weighted average common shares - Basic:        
Weighted average common shares - Basic 1,214 1,216 1,214 1,216
Net income per common share - Basic:        
Net income per common share - Basic $ 0.83 $ 0.68 $ 0.85 $ 0.40
Net income per common share - Diluted:        
Net income per common share - Diluted $ 0.90 $ 0.74 $ 0.93 $ 0.44