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REVENUE FROM CONTRACTS WITH CUSTOMERS - NARRATIVE (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Disaggregation of Revenue [Line Items]      
Contract with customer, liability, current $ 751   $ 1,097
Contract with customer, liability, revenue recognized $ 573 $ 1,480  
Percentage anticipated to be recognized in next 12 months 7.00%    
Revenue, remaining performance obligation (backlog) $ 2,615    
Capitalized contract cost net, preconstruction $ 147   $ 145
Minimum      
Disaggregation of Revenue [Line Items]      
Contract receivable retainage percentage 5.00%    
Maximum      
Disaggregation of Revenue [Line Items]      
Contract receivable retainage percentage 10.00%