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Acquisitions and Divestitures (Frontier Acquisition) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Oct. 01, 2019
Sep. 30, 2019
Sep. 30, 2018
Business Acquisition [Line Items]        
Goodwill $ 397,205   $ 392,890 $ 411,346
Frontier [Member]        
Business Acquisition [Line Items]        
Current assets   $ 3,186    
Business Acquisition, Transaction Costs 591      
Business Acquisition, Percentage of Voting Interests Acquired   60.00%    
Net assets acquired   $ 10,885    
Business Acquisition, Percentage Of Voting Interest Remaining   40.00%    
Business Acquisition, Maximum Percentage Of Voting Interest To Be Acquired With Predetermined Price   10.00%    
Property, plant and equipment   $ 2,963    
Goodwill   1,798    
Intangible assets   11,571    
Total assets acquired   19,518    
Liabilities related to Option and Purchase Right   (7,167)    
Other liabilities assumed   $ (1,466)    
Other Current Liabilities [Member] | Frontier [Member]        
Business Acquisition [Line Items]        
Open Option Contracts Written, at Fair Value 506      
Other Noncurrent Liabilities [Member] | Frontier [Member]        
Business Acquisition [Line Items]        
Open Option Contracts Written, at Fair Value $ 6,661