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Business Combinations - Additional Information (Details)
€ in Millions, £ in Millions
9 Months Ended
Jul. 03, 2017
USD ($)
Jul. 03, 2017
EUR (€)
Jan. 10, 2017
USD ($)
Jan. 10, 2017
GBP (£)
Sep. 29, 2017
USD ($)
Jul. 03, 2017
EUR (€)
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]              
Goodwill         $ 207,720,000   $ 108,128,000
Pre-tax gain on excess fair value of equity interest held         26,409,000    
World of Medicine GmbH              
Business Acquisition [Line Items]              
Percentage of shares acquired 100.00%         100.00%  
Total purchase price $ 134,934,000         € 118.1  
Intangible assets 59,732,000            
Goodwill 53,775,000            
Goodwill assets expected to be deductible for tax purposes 0            
Revenues         24,800,000    
Income (loss) from continuing operations before income taxes         (1,600,000)    
Amortization of inventory fair value adjustments and purchased intangible assets, included in operating income (loss)         $ 4,900,000    
World of Medicine GmbH | Maximum              
Business Acquisition [Line Items]              
Estimated fair value measurement period from acquisition date         1 year    
World of Medicine GmbH | Revolving Credit Facility              
Business Acquisition [Line Items]              
Amount draw-down to finance acquisition $ 134,700,000 € 118.0          
Thing Magic              
Business Acquisition [Line Items]              
Total purchase price     $ 19,089,000        
Intangible assets     7,423,000        
Goodwill     9,929,000        
Revenues         $ 6,500,000    
Income (loss) from continuing operations before income taxes         100,000    
Amortization of inventory fair value adjustments and purchased intangible assets, included in operating income (loss)         $ 1,200,000    
Thing Magic | Maximum              
Business Acquisition [Line Items]              
Estimated fair value measurement period from acquisition date         1 year    
Thing Magic | Revolving Credit Facility              
Business Acquisition [Line Items]              
Amount draw-down to finance acquisition     $ 12,000,000        
Laser Quantum              
Business Acquisition [Line Items]              
Percentage of shares acquired     35.00%        
Total purchase price     $ 87,271,000        
Intangible assets     38,955,000        
Goodwill     31,041,000        
Goodwill assets expected to be deductible for tax purposes     0        
Revenues         $ 32,300,000    
Income (loss) from continuing operations before income taxes         7,000,000    
Amortization of inventory fair value adjustments and purchased intangible assets, included in operating income (loss)         $ 5,800,000    
Total purchase price paid by Novanta     $ 31,052,000 £ 25.5      
Percentage of equity interest held before acquisition     41.00%       41.00%
Percentage of equity interest held after acquisition     76.00%        
Option to purchase and sell remaining shareholders shares, year         2020    
Pre-tax gain on excess fair value of equity interest held         $ 26,409,000    
Equity method investment ownership percentage on Laser Quantum     41.00% 41.00%      
Non controlling interest held by remaining shareholders     24.00%        
Laser Quantum | Maximum              
Business Acquisition [Line Items]              
Estimated fair value measurement period from acquisition date         1 year    
Laser Quantum | Revolving Credit Facility              
Business Acquisition [Line Items]              
Amount draw-down to finance acquisition     $ 30,000,000