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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% |

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