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Business Combinations - Schedule of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 08, 2018
Sep. 30, 2017
Nov. 07, 2016
Business Acquisition [Line Items]        
Goodwill $ 444,066   $ 417,694  
O.R. Lasertechnologies GmbH        
Business Acquisition [Line Items]        
Cash, cash equivalents and short-term investments   $ 1,936    
Accounts receivable   3,973    
Inventory   2,360    
Prepaid expenses and other assets   630    
Property and equipment   1,515    
Other long-term liabilities   (5,119)    
Deferred tax liabilities   (4,517)    
Goodwill   31,456    
Total   47,384    
O.R. Lasertechnologies GmbH | Existing technology        
Business Acquisition [Line Items]        
Intangible assets:   14,100    
O.R. Lasertechnologies GmbH | Non-competition        
Business Acquisition [Line Items]        
Intangible assets:   200    
O.R. Lasertechnologies GmbH | Backlog        
Business Acquisition [Line Items]        
Intangible assets:   100    
O.R. Lasertechnologies GmbH | Customer relationships        
Business Acquisition [Line Items]        
Intangible assets:   700    
O.R. Lasertechnologies GmbH | Trademarks        
Business Acquisition [Line Items]        
Intangible assets:   $ 50    
Rofin-Sinar        
Business Acquisition [Line Items]        
Cash, cash equivalents and short-term investments       $ 163,425
Accounts receivable       90,877
Inventory       189,869
Prepaid expenses and other assets       15,362
Assets held-for-sale, current       29,545
Property and equipment       125,723
Other long-term liabilities       (122,517)
Other assets       31,854
Goodwill       298,170
Current portion of long-term obligations       (3,633)
Current liabilities held for sale       (7,001)
Accounts payable       (21,314)
Other current liabilities       (68,242)
Long-term debt       (11,641)
Total       936,314
Rofin-Sinar | Existing technology        
Business Acquisition [Line Items]        
Intangible assets:       169,029
Rofin-Sinar | In-process research and development        
Business Acquisition [Line Items]        
Intangible assets:       6,000
Rofin-Sinar | Backlog        
Business Acquisition [Line Items]        
Intangible assets:       5,600
Rofin-Sinar | Customer relationships        
Business Acquisition [Line Items]        
Intangible assets:       39,209
Rofin-Sinar | Trademarks        
Business Acquisition [Line Items]        
Intangible assets:       5,699
Rofin-Sinar | Patents        
Business Acquisition [Line Items]        
Intangible assets:       $ 300