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Redeemable Noncontrolling Interest- Additional Information (Details)
$ in Thousands, £ in Millions
3 Months Ended 9 Months Ended
Sep. 29, 2017
USD ($)
Sep. 29, 2017
USD ($)
[1]
Jan. 10, 2017
USD ($)
Jan. 10, 2017
GBP (£)
Dec. 31, 2016
Minority Interest [Line Items]          
Adjustment of redeemable noncontrolling interest to estimated redemption value $ 7,585 $ 11,303      
Laser Quantum          
Minority Interest [Line Items]          
Percentage of equity interest held before acquisition     41.00% 41.00% 41.00%
Percentage of equity interest held after acquisition     76.00% 76.00%  
Initial fair value of noncontrolling interest     $ 21,582 £ 17.7  
[1] Adjustment of the carrying value of redeemable noncontrolling interest to the estimated redemption value was recognized in retained earnings instead of the consolidated statement of operations but was included in the computation of earnings per share attributable to Novanta Inc. (see Note 5.)