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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Reconciliation of Changes in the Fair Value of Financial Assets and Liabilities Classified as Level 3 (Details) - Level 3 - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Reconciliation of changes in the fair value of our financial assets and liabilities        
Net liabilities at beginning of period $ 8,973 $ 19,873 $ 9,123 $ 18,373
Additions 0 0 0 1,500
Total gains or losses included in earnings 0 (3,800) 100 (3,800)
Settlements 0 (4,250) (250) (4,250)
Net liabilities at end of period $ 8,973 $ 11,823 $ 8,973 $ 11,823