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REVENUE RECOGNITION - Changes in contract assets and liabilities (Details)
$ in Thousands
6 Months Ended
Mar. 31, 2022
USD ($)
Contract assets  
Opening balance $ 6,194
Additions 17,009
Deductions (10,510)
Ending balance 12,693
Contract liabilities  
Opening balance 26,614
Additions 249,972
Deductions (206,348)
Ending balance $ 70,238