Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Name:	us-gaap_RestructuringCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

RESTRUCTURING CHARGES - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Oct. 31, 2018
Restructuring and Related Costs [Line Items]
Restructuring charges	$ 3.7	$ 4.1
Amounts remaining to be incurred	13.2		$ 18.6
Employee Separation Costs
Restructuring and Related Costs [Line Items]
Restructuring charges	3.5
Other Costs
Restructuring and Related Costs [Line Items]
Restructuring charges	$ 0.2