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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%

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