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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jan. 01, 2016
Oct. 02, 2015
Jan. 02, 2015
Property, plant and equipment, accumulated depreciation $ 119,171 $ 116,902 $ 109,915
Class A [Member]      
Common stock, shares issued 8,805,489 8,770,612 8,790,733
Common stock, shares outstanding 8,805,489 8,770,612 8,790,733
Treasury stock, shares 37,015 33,241 28,118
Class B [Member]      
Common stock, shares issued 1,212,382 1,212,382 1,212,382
Common stock, shares outstanding 1,212,382 1,212,382 1,212,382