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Consolidated Statements Of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Sep. 28, 2012
Sep. 30, 2011
Oct. 01, 2010
Net sales $ 412,292 $ 407,422 $ 382,432
Cost of sales 247,970 244,287 228,909
Gross profit 164,322 163,135 153,523
Operating expenses:      
Marketing and selling 88,468 90,336 86,677
Administrative management, finance and information systems 43,209 40,310 38,842
Litigation settlement recovery (3,500)    
Research and development 14,732 14,819 13,450
Total operating expenses 142,909 145,465 138,969
Operating profit 21,413 17,670 14,554
Interest income (140) (90) (62)
Interest expense 2,258 3,220 5,057
Other (income) expense, net (631) 2,290 367
Income before income taxes 19,926 12,250 9,192
Income tax expense (benefit) 9,792 (20,394) 2,653
Net income (loss) $ 10,134 $ 32,644 $ 6,539
Weighted average common shares - Basic:      
Dilutive stock options 8 26 42
Weighted average common shares - Dilutive 9,379 9,287 9,267
Class A [Member]
      
Weighted average common shares - Basic:      
Weighted average common shares - Basic 8,155 8,045 8,008
Net income per common share - Basic:      
Net income per common share - Basic $ 1.04 $ 3.40 $ 0.69
Net income per common share - Diluted:      
Net income per common share - Diluted $ 1.03 $ 3.36 $ 0.68
Class B [Member]
      
Weighted average common shares - Basic:      
Weighted average common shares - Basic 1,216 1,216 1,217
Net income per common share - Basic:      
Net income per common share - Basic $ 0.94 $ 3.07 $ 0.63
Net income per common share - Diluted:      
Net income per common share - Diluted $ 1.03 $ 3.36 $ 0.68