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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2018 | Jan. 31, 2017 | Oct. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Net discrete tax benefit from remeasurement of deferred taxes at new rate due to Tax Act | $ 28.7 |  |
One-time transition tax on deemed repatriation of indefinitely reinvested earnings | 7.0 |  |
Income tax benefit (provision) | 22.2 | $ (5.9) |
Discrete tax benefit related to enactment of Tax Act | $ 21.7 |  |
Income tax benefit related to vesting of share-based compensation awards |  | $ 2.0 |
Forecast |  |  |
Income Taxes [Line Items] |  |  |
U.S. statutory federal rate (percent) |  |  | 23.30%

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- Definition Amount of reasonable estimate for income tax expense (benefit) from effect of Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete. + References No definition available. + Details
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- Definition Amount of reasonable estimate for income tax expense from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete. + References No definition available. + Details
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