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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Dec. 29, 2017
Sep. 29, 2017
Dec. 30, 2016
Property, plant and equipment, accumulated depreciation $ 135,497 $ 132,567 $ 125,286
Class A      
Common stock, shares issued (shares) 8,781,668 8,784,513 8,773,175
Common stock, shares outstanding (shares) 8,781,668 8,784,513 8,773,175
Treasury stock, shares (shares) 69,982 67,137 79,071
Class B      
Common stock, shares issued (shares) 1,211,686 1,211,686 1,212,006
Common stock, shares outstanding (shares) 1,211,686 1,211,686 1,212,006