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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 30, 2018
Dec. 29, 2017
Statement Of Financial Position [Abstract]    
Accounts receivable and unbilled revenue, allowance $ 2,312 $ 2,601
Preferred stock, par value $ 1 $ 1
Preferred stock, shares authorized 1,250,000 1,250,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 125,000,000 125,000,000
Common stock, shares issued 56,465,620 55,744,893
Treasury stock, at cost, shares 27,071,782 26,945,776