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REVENUE FROM CONTRACTS WITH CUSTOMERS - NARRATIVE (Details) - USD ($)
$ in Thousands
9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Sep. 30, 2022
Disaggregation of Revenue [Line Items]      
Contract with customer, liability, current $ 305   $ 1,087
Contract with customer, liability, revenue recognized $ 1,012 $ 342  
Percentage anticipated to be recognized in next 12 months 100.00%    
Revenue, remaining performance obligation (backlog) $ 4,052    
Capitalized contract cost net, preconstruction $ 581   $ 689
Minimum      
Disaggregation of Revenue [Line Items]      
Contract receivable retainage percentage 5.00%    
Maximum      
Disaggregation of Revenue [Line Items]      
Contract receivable retainage percentage 10.00%