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Components of Non-Operating Gains (Losses), Net (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Selected Account Information        
Gain on debt extinguishment $ 5,329
Unrealized gain (loss) on equity securities 9 31 (58) (103)
Other 85
Total non-operating gains (losses), net $ 9 $ 31 $ 5,356 $ (103)