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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jan. 03, 2020
Dec. 28, 2018
Statement Of Financial Position [Abstract]    
Accounts receivable, net of allowance for contract losses and doubtful accounts $ 4,295 $ 4,066
Preferred Stock, Par or Stated Value Per Share $ 0.001 $ 0.001
Preferred Stock, Shares Authorized 2,000,000 2,000,000
Preferred Stock, Shares Outstanding 0 0
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 120,000,000 120,000,000
Common stock, shares issued 65,707,000 65,707,000
Treasury stock, shares 13,951,000 14,208,000