Business Segment Information - Net Sales to External Customers by Geographical Area (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2018	Apr. 30, 2017
Net sales
Total net sales	$ 968.3	$ 887.4	$ 1,874.0	$ 1,708.3
United States
Net sales
Total net sales	463.5	434.5	896.2	842.5
Europe, Middle East and Africa
Net sales
Total net sales	370.7	325.5	702.0	611.4
Asia Pacific and other Americas
Net sales
Total net sales	$ 134.1	$ 127.4	$ 275.8	$ 254.4

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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