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REVENUE - Contract Balances (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Contract costs and recognized income not yet billed, net of progress payments $ 96,826 $ 105,111
Decrease in contract assets balance 8,285  
Contract costs and recognized income not yet billed, net of progress payments, noncurrent 13,900 13,100
Unbilled receivable reserve 4,100  
Billings in excess of costs 21,217  
Increase (decrease) in billings in excess of costs $ (5,042)  
Calculated under Revenue Guidance in Effect before Topic 606    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Contract costs and recognized income not yet billed, net of progress payments   105,111
Billings in excess of costs   $ 26,259