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Income Taxes - Net deferred tax assets/ (liabilities) (Detail) - USD ($)
$ in Millions
Oct. 31, 2018
Oct. 31, 2017
Income Tax Disclosure [Abstract]    
Noncurrent deferred tax asset $ 0.1 $ 1.5
Noncurrent deferred tax liability (19.9) (22.5)
Net deferred tax liability $ (19.8) $ (21.0)