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Acquisitions Opening Balance Sheet (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Sep. 30, 2020
Business Acquisition [Line Items]    
Goodwill $ 404,393 $ 397,205
Ultrapure    
Business Acquisition [Line Items]    
Current assets 2,366  
Property, plant and equipment 963  
Goodwill 2,545  
Intangible assets 3,751  
Other non-current assets 22  
Total assets acquired 9,647  
Total liabilities assumed (904)  
Net assets acquired $ 8,743