FINANCIAL INSTRUMENTS, FAIR VALUE AND RISK MANAGEMENT - Fair Value Measurements Narrative (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Apr. 30, 2017	Oct. 31, 2016
Fair Value Disclosures [Abstract]
Gross unrealized loss	$ 2.0	$ 2.7
Gross unrealized gain	$ 0.2	$ 0.1

Amount of unrealized gain related to the increase in fair value of foreign currency exchange rate derivatives designated as cash flow hedging instruments. Recorded in accumulated other comprehensive income to the extent that the cash flow hedge is determined to be effective.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

Name:	us-gaap_UnrealizedGainOnForeignCurrencyDerivativesBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration