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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Reconciliation of Changes in Fair Value of Financial Assets and Liabilities Classified as Level 3 (Details) - Level 3 - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Reconciliation of changes in the fair value of our financial assets and liabilities    
Net liabilities at beginning of period $ 9,123 $ 18,373
Additions 0 1,500
Total gains or losses included in earnings 1,123 (2,500)
Settlements (7,250) (8,250)
Net liabilities at end of period $ 2,996 $ 9,123