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Condensed Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Dec. 30, 2011
Dec. 31, 2010
Net sales $ 80,176 $ 78,700
Cost of sales 49,075 48,020
Gross profit 31,101 30,680
Operating expenses:    
Marketing and selling 20,385 19,308
Administrative management, finance and information systems 10,838 9,091
Research and development 3,597 3,616
Total operating expenses 34,820 32,015
Operating loss (3,719) (1,335)
Interest income (21) (29)
Interest expense 596 853
Other expense (income), net (1,192) (6)
Loss before income taxes (3,102) (2,153)
Income tax benefit (158) (916)
Net loss $ (2,944) $ (1,237)
Participating securities 480 357
Earnings Per Share, Diluted, Other Disclosures [Abstract]    
Weighted average common shares - Dilutive 9,807 9,611
Class A [Member]
    
Weighted average common shares - Basic:    
Weighted average common shares, Basic 8,111 8,038
Earnings Per Share [Abstract]    
Net loss per common share, Basic and Dilutive $ (0.30) $ (0.13)
Class B [Member]
    
Weighted average common shares - Basic:    
Weighted average common shares, Basic 1,216 1,216
Earnings Per Share [Abstract]    
Net loss per common share, Basic and Dilutive $ (0.30) $ (0.13)