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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 25, 2016
Dec. 27, 2015
Statement Of Financial Position [Abstract]    
Allowances on accounts receivable $ 78 $ 14
Common stock, par value $ 0.01 $ 0.01
Common stock, authorized 200,000,000 200,000,000
Common stock, outstanding 25,139,127 26,304,261
Treasury stock, shares 5,753,412 4,033,910