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REVENUE RECOGNITION - Changes in contract assets and liabilities (Details)
$ in Thousands
3 Months Ended
Dec. 31, 2021
USD ($)
Contract assets  
Opening balance $ 6,194
Additions 5,362
Deductions (3,310)
Ending balance 8,246
Contract liabilities  
Opening balance 26,614
Additions 124,057
Deductions (106,146)
Ending balance $ 44,525