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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 30, 2017
Statement Of Financial Position [Abstract]    
Receivables, allowances $ 2,021 $ 2,001
Common stock, par value $ 0 $ 0
Common stock, shares authorized 1,000,000,000 1,000,000,000
Common stock, shares issued 120,353,000 118,947,000
Treasury stock, shares 53,765,000 54,258,000