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Acquisitions and Divestitures Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 17, 2020
Dec. 31, 2019
Oct. 01, 2019
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Sep. 30, 2019
Business Acquisition [Line Items]                
Document Period End Date         Jun. 30, 2020      
Option and purchase right       $ 506 $ 506     $ 0
Gain on sale of business         68,051 $ 0    
Repayments of debt             $ 104,936  
Frontier [Member]                
Business Acquisition [Line Items]                
Percentage of voting interests acquired     60.00%          
Payments to acquire businesses     $ 11,160 10,885        
Payments for (Proceeds from) Previous Acquisition       275        
Acquisition costs       424 424      
Remaining percentage to be acquired     40.00%          
Maximum percentage of voting interest to be acquired with predetermined price     10.00%          
Other Current Liabilities | Frontier [Member]                
Business Acquisition [Line Items]                
Option and purchase right       506 506      
Other Noncurrent Liabilities | Frontier [Member]                
Business Acquisition [Line Items]                
Option and purchase right       6,661 6,661      
Memcor [Member]                
Business Acquisition [Line Items]                
Acquisition costs   $ 1,000            
Proceeds from divestiture of businesses   110,000            
Gross proceeds from businesses and interest in affiliates         $ 131,011      
Gain on sale of business   49,000   $ 9,000        
Payments to employees   $ 8,300            
First Lien Term Facility, due December 20, 2024 | Memcor [Member]                
Business Acquisition [Line Items]                
Repayments of debt $ 100,000