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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Sep. 28, 2018
Sep. 29, 2017
Property, plant and equipment, accumulated depreciation $ 131,322 $ 132,567
Preferred stock, shares issued (shares) 0 0
Treasury stock, shares (shares) 67,655 67,137
Class A    
Common stock, shares issued (shares) 8,787,360 8,784,513
Common stock, shares outstanding (shares) 8,787,360 8,784,513
Class B    
Common stock, shares issued (shares) 1,211,686 1,211,686
Common stock, shares outstanding (shares) 1,211,686 1,211,686