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Business Combinations (Details)
$ in Thousands
9 Months Ended
Jun. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Business Acquisition [Line Items]    
Contingent consideration $ 795 $ 786
2017 Business Acquisitions [Member]    
Business Acquisition [Line Items]    
Number Of Businesses Acquired 3  
Total Consideration Transferred $ 20,979  
2018 Business Acquisitions [Member]    
Business Acquisition [Line Items]    
Total Consideration Transferred 6,179  
Cash Purchase Consideration 5,806  
Additional Consideration To Be Paid 125  
Contingent Consideration Payment $ 248  
Business Acquisition Technical Services [Member] | Commercial & Industrial [Member]    
Business Acquisition [Line Items]    
Minority Interest Ownership Percentage By Parent 80.00%  
Business Acquisition NEXT [Member] | Commercial & Industrial [Member]    
Business Acquisition [Line Items]    
Minority Interest Ownership Percentage By Parent 80.00%