CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 28, 2021	Dec. 27, 2020
Accounts receivable, allowance for credit loss	$ 12,498	$ 13,797
Accumulated depreciation and amortization	$ 900,278	$ 886,149
Common stock, par value (in usd per share)	$ 0.10	$ 0.10
Class A Common Stock
Authorized shares (in shares)	300,000,000	300,000,000
Issued shares (in shares)	175,916,992	175,308,672
Treasury shares (in shares)	8,870,801	8,870,801
Class B Common Stock
Authorized shares (in shares)	781,724	781,724
Issued shares (in shares)	781,724	781,724

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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Amount of allowance for credit loss on accounts receivable, classified as current.

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