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Business Combination - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 01, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Business Acquisition [Line Items]        
Purchase consideration of cash acquired   $ 126,877 $ 0 $ 1,182,187
Additions due to acquisition   81,960    
Electronic Materials        
Business Acquisition [Line Items]        
Additions due to acquisition   $ 81,960    
ITS        
Business Acquisition [Line Items]        
Consideration transferred $ 129,071      
Purchase consideration of cash acquired 126,877      
Fair Value $ 37,200      
Weighted average useful life 12 years 2 months 12 days      
ITS | Electronic Materials        
Business Acquisition [Line Items]        
Additions due to acquisition $ 81,960