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Components of Non-Operating Gains (Losses), Net (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Selected Account Information        
Gain on debt extinguishment $ 380 $ 5,329
Unrealized loss on equity securities (34) (62) (67) (134)
Other 85 85
Total non-operating gains (losses), net $ 431 $ (62) $ 5,347 $ (134)