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Business Combinations - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 08, 2018
Nov. 07, 2016
Mar. 31, 2018
Apr. 01, 2017
Dec. 31, 2016
Mar. 31, 2018
Apr. 01, 2017
Sep. 30, 2017
Business Acquisition [Line Items]                
Gain from business combination     $ 0 $ 0   $ 0 $ (5,416)  
O.R. Lasertechnologies GmbH                
Business Acquisition [Line Items]                
Business combination costs $ 47,400              
Business Combination, Acquisition Related Costs           $ 400    
O.R. Lasertechnologies GmbH | Minimum                
Business Acquisition [Line Items]                
Intangible asset, useful life 1 year              
O.R. Lasertechnologies GmbH | Maximum                
Business Acquisition [Line Items]                
Intangible asset, useful life 8 years              
Rofin-Sinar                
Business Acquisition [Line Items]                
Business combination costs   $ 919,781            
Business Combination, Acquisition Related Costs               $ 17,600
Total purchase price to allocate   $ 936,314            
Acquisition price per share of Rofin   $ 32.5            
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
Sales revenue       110,700     185,100  
Net income (loss) from continuing operations       $ (17,900)     $ (29,900)  
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 | 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 | Minimum | Property and equipment                
Business Acquisition [Line Items]                
Intangible asset, useful life               3 years
Rofin-Sinar | Minimum | Existing technology                
Business Acquisition [Line Items]                
Intangible asset, useful life               3 years
Rofin-Sinar | Minimum | Customer relationships                
Business Acquisition [Line Items]                
Intangible asset, useful life               5 years
Rofin-Sinar | Maximum | Property and equipment                
Business Acquisition [Line Items]                
Intangible asset, useful life               31 years
Rofin-Sinar | Maximum | Existing technology                
Business Acquisition [Line Items]                
Intangible asset, useful life               5 years
Rofin-Sinar | Maximum | Customer relationships                
Business Acquisition [Line Items]                
Intangible asset, useful life               10 years