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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Jun. 28, 2013
Sep. 28, 2012
Jun. 29, 2012
Property, plant and equipment, accumulated depreciation $ 103,253 $ 98,235 $ 95,416
Treasury stock, shares 35,680 516 516
Class A [Member]
     
Common stock, shares issued 8,724,070 8,676,703 8,678,369
Common stock, shares outstanding 8,724,070 8,676,703 8,678,369
Class B [Member]
     
Common stock, shares issued 1,213,334 1,215,758 1,215,842
Common stock, shares outstanding 1,213,334 1,215,758 1,215,842