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INCOME TAXES (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2018
Jul. 31, 2017
Oct. 31, 2018
Income Tax [Line Items]          
Tax Cuts And Jobs Act Of 2017 Change In Tax Rate Deferred Tax Asset Income Tax Benefit     $ (69.3)    
Tax cuts and jobs act of 2017, incomplete accounting, change in tax rate, deferred tax liability, provisional income tax benefit     33.4    
Tax cuts and jobs act of 2017, expense (benefit)     (35.9)    
Income tax expense $ 25.7 $ 27.2 $ 31.2 $ 62.0  
Forecast          
Income Tax [Line Items]          
Blended tax rate         23.33%