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Selected Quarterly Financial Data (Unaudited) - Footnote Disclosure (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
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Oct. 31, 2018 | Jan. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |  |
Tax benefit, reduction resulting from enactment of the tax act |  | $ 22.6
One-time net tax act benefit related to Tax Act (usd per share) |  | $ 0.34
Goodwill and intangible asset impairment | $ 26.5 |
Goodwill and intangible asset impairment (usd per share) | $ 0.40 |

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