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Consolidated Statements Of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Sep. 27, 2013
Sep. 28, 2012
Sep. 30, 2011
Net sales $ 426,461 $ 412,292 $ 407,422
Cost of sales 255,412 247,970 244,287
Gross profit 171,049 164,322 163,135
Operating expenses:      
Marketing and selling 88,218 88,468 90,336
Administrative management, finance and information systems 41,894 43,209 40,310
Litigation settlement recovery   (3,500)  
Research and development 15,346 14,732 14,819
Total operating expenses 145,458 142,909 145,465
Operating profit 25,591 21,413 17,670
Interest income (91) (140) (90)
Interest expense 1,285 2,258 3,220
Other (income) expense, net (263) (631) 2,290
Income before income taxes 24,660 19,926 12,250
Income tax expense (benefit) 5,333 9,792 (20,394)
Net income $ 19,327 $ 10,134 $ 32,644
Weighted average common shares - Basic:      
Dilutive stock options and restricted stock units 6 8 26
Weighted average common shares - Dilutive 9,523 9,379 9,287
Class A [Member]
      
Weighted average common shares - Basic:      
Weighted average common shares - Basic 8,305 8,155 8,045
Net income per common share - Basic:      
Net income per common share - Basic $ 1.98 $ 1.04 $ 3.40
Net income per common share - Diluted:      
Net income per common share - Diluted $ 1.95 $ 1.03 $ 3.36
Class B [Member]
      
Weighted average common shares - Basic:      
Weighted average common shares - Basic 1,212 1,216 1,216
Net income per common share - Basic:      
Net income per common share - Basic $ 1.79 $ 0.94 $ 3.07
Net income per common share - Diluted:      
Net income per common share - Diluted $ 1.95 $ 1.03 $ 3.36