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BUSINESS COMBINATIONS (Details) - USD ($)
$ in Thousands
3 Months Ended
Aug. 21, 2019
Nov. 01, 2018
Mar. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Business Acquisition [Line Items]              
Goodwill       $ 45,653 $ 82,786 $ 64,777 $ 51,705
DrillScan Energy              
Business Acquisition [Line Items]              
Consideration given $ 32,700            
Contingent consideration 17,700            
Fair value of total assets acquired 36,300            
Fair value of total liabilities assumed 3,600            
Goodwill 14,900            
Identifiable intangible assets $ 19,100            
Increase in goodwill     $ 1,200        
Angus Jamieson Consulting              
Business Acquisition [Line Items]              
Consideration given   $ 3,400          
Goodwill   $ 3,100