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Acquisitions Opening Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Sep. 30, 2020
Business Acquisition [Line Items]    
Goodwill $ 408,593 $ 397,205
Ultrapure    
Business Acquisition [Line Items]    
Current assets 2,039  
Property, plant and equipment 900  
Goodwill 6,088  
Other non-current assets 22  
Total assets acquired 9,049  
Total liabilities assumed (306)  
Net assets acquired $ 8,743