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Income Taxes - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 28, 2018
Sep. 29, 2017
Sep. 28, 2018
Sep. 29, 2017
Dec. 31, 2017
Sep. 27, 2018
Jan. 10, 2017
Income Taxes [Line Items]              
Statutory tax rate 21.00%   21.00%   35.00%    
Effective tax rate on income from operations 19.50% 11.90% 17.30% 11.60%      
Gain on acquisition of business       $ 26,409      
Deferred tax liability write off   $ 1,500   $ 1,500      
Favorable impact on effective tax rate, write off percentage       13.70%      
Additional income tax provision from revaluation of certain deferred tax assets and liabilities at the new tax rate         $ 2,800    
Income tax measurement period under ASU 2018-05     1 year        
Laser Quantum              
Income Taxes [Line Items]              
Percentage of additional shares acquired           24.00% 35.00%
Canada Revenue Agency | CANADA              
Income Taxes [Line Items]              
Statutory tax rate 29.00% 29.00% 29.00% 29.00%