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Income Taxes Components of Income (Loss) Before Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Components of Income (Loss) before Income Taxes [Abstract]    
Document Period End Date Dec. 31, 2018  
Domestic $ 19,788 $ (34,946)
Foreign (1,103) 3,442
Loss before income taxes $ 18,685 $ (31,504)