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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 22, 2017
Jan. 31, 2018
Apr. 30, 2018
Oct. 31, 2018
Dec. 31, 2017
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     21.00%   35.00%
Estimated income tax charge $ 1.7        
Forecast          
Income Taxes [Line Items]          
Corporate income tax rate       26.00%