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Acquisitions and Divestitures (ATG Acquisition) (Details)
£ in Thousands, $ in Thousands
May 25, 2019
GBP (£)
May 25, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Business Acquisition [Line Items]          
Goodwill     $ 397,205 $ 392,890 $ 411,346
ATG UV [Member]          
Business Acquisition [Line Items]          
Current assets   $ 6,296      
Payments to Acquire Businesses, Gross £ 5,500 6,931      
Business Acquisition, Transaction Costs       $ 193  
Property, plant and equipment   362      
Goodwill   1,738      
Intangible assets   2,277      
Total assets acquired   10,673      
Other liabilities assumed   (3,742)      
Net assets acquired   $ 6,931