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Business Combinations - Rofin Acquisition Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Nov. 07, 2016
Dec. 30, 2017
Dec. 31, 2016
Sep. 30, 2017
Business Acquisition [Line Items]        
Acquisition price per share of Rofin $ 32.5      
Gain from business combination   $ 0 $ (5,416)  
Rofin-Sinar        
Business Acquisition [Line Items]        
Cash settlement paid for Rofin employee stock options $ 15,290      
Total estimated merger consideration for canceled of options held by Rofin employees 11,100      
Post merger stock compensation expense $ 4,152      
Gain from business combination     (5,400)  
Acquired finished goods and work in process amortization period   6 months    
Acquisition related costs       $ 17,600
Sales revenue     74,400  
Net income (loss) from continuing operations     (12,000)  
Rofin-Sinar | Inventory        
Business Acquisition [Line Items]        
Assets at fair value   $ 26,400    
incremental cost of sales recorded from inventory fair value adjustment     $ 26,400  
Rofin-Sinar | Property and equipment        
Business Acquisition [Line Items]        
Assets at fair value   $ 36,000    
Rofin-Sinar | Property and equipment | Minimum        
Business Acquisition [Line Items]        
Intangible asset, useful life   3 years    
Rofin-Sinar | Property and equipment | Maximum        
Business Acquisition [Line Items]        
Intangible asset, useful life   31 years    
Rofin-Sinar | Existing technology | Minimum        
Business Acquisition [Line Items]        
Intangible asset, useful life   3 years    
Rofin-Sinar | Existing technology | Maximum        
Business Acquisition [Line Items]        
Intangible asset, useful life   5 years    
Rofin-Sinar | Backlog        
Business Acquisition [Line Items]        
Intangible asset, useful life   6 months    
Rofin-Sinar | Trademarks        
Business Acquisition [Line Items]        
Intangible asset, useful life   3 years    
Rofin-Sinar | Patents        
Business Acquisition [Line Items]        
Intangible asset, useful life   5 years    
Rofin-Sinar | Customer relationships | Minimum        
Business Acquisition [Line Items]        
Intangible asset, useful life   5 years    
Rofin-Sinar | Customer relationships | Maximum        
Business Acquisition [Line Items]        
Intangible asset, useful life   10 years