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Business Segment Information - Net Sales to External Customers by Geographical Area (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Oct. 31, 2016 | Jul. 31, 2016 | Apr. 30, 2016 | Jan. 31, 2016 | Oct. 31, 2015 | Jul. 31, 2015 | Apr. 30, 2015 | Jan. 31, 2015 | Oct. 31, 2016 | Oct. 31, 2015 | Oct. 31, 2014
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales | $ 867.6 | $ 845.0 | $ 839.6 | $ 771.4 | $ 868.5 | $ 930.0 | $ 915.9 | $ 902.3 | $ 3,323.6 | $ 3,616.7 | $ 4,239.1
United States |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 1,610.8 | 1,688.3 | 1,905.8
Europe, Middle East, and Africa |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 1,208.4 | 1,287.2 | 1,596.2
Asia Pacific and other Americas |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | $ 504.4 | $ 641.2 | $ 737.1

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- Definition 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. + References 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=26872669&loc=d3e20235-122688 + Details
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