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REVENUE - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Revenue from Contract with Customer [Abstract]      
Net favorable (unfavorable) catch-up adjustments to income from operations $ (1,500) $ (3,000)  
Accumulated estimated costs to complete loss contracts $ 9,000   $ 10,800
Customer Concentration Risk | CPP and HBP      
Revenue from Contract with Customer [Abstract]      
Percentage of performance obligations recognized at a point in time 86.00%    
Concentration Risk [Line Items]      
Percentage of performance obligations recognized at a point in time 86.00%    
Revenue from Contract with Customer Benchmark | Government Contracts Concentration Risk | Transferred over Time      
Concentration Risk [Line Items]      
Concentration risk (in percentage) 14.00%