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Income Taxes Components of Income (Loss) Before Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Components of Income (Loss) before Income Taxes [Abstract]        
Document Period End Date     Mar. 31, 2019  
Domestic $ (35,351) $ (80,758) $ (15,563) $ (119,867)
Foreign 13,644 (84,390) 12,541 (76,785)
Loss before income taxes $ (21,707) $ (165,148) $ (3,022) $ (196,652)