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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2018
Jan. 31, 2018
Dec. 22, 2017
Jan. 31, 2018
Income Taxes [Line Items]        
Non-cash charges related to the revaluation of our net deferred tax assets and the transition tax on the deemed repatriation of foreign earnings       $ 1.7
Revaluation of net deferred tax assets       1.4
Transition tax on deemed repatriation of foreign earnings       $ 0.3
Corporate income tax rate 35.00% 26.00%    
Estimated income tax charge     $ 1.7  
Forecast        
Income Taxes [Line Items]        
Corporate income tax rate 21.00%