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CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - USD ($) $ in Thousands	Dec. 28, 2018	Sep. 28, 2018	Dec. 29, 2017
Property, plant and equipment, accumulated depreciation	$ 133,958	$ 131,322	$ 135,497
Class A
Common stock, shares issued (shares)	8,825,790	8,787,360	8,785,735
Common stock, shares outstanding (shares)	8,825,790	8,787,360	8,785,735
Treasury stock, shares (shares)	29,225	67,655	69,982
Class B
Common stock, shares issued (shares)	1,211,602	1,211,686	1,211,686
Common stock, shares outstanding (shares)	1,211,602	1,211,686	1,211,686

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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