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Restructuring Charges - Reconciliation of Beginning and Ended Restructuring Reserve Balances (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2016 | Oct. 31, 2015 | Oct. 31, 2016 | Oct. 31, 2015 | Oct. 31, 2014
Restructuring Reserve [Roll Forward] |  |  |  |  |
Beginning balance |  |  | $ 21.3 | $ 4.1 |
Costs incurred and charged to expense | $ 9.0 | $ 13.3 | 26.9 | 40.0 | $ 16.1
Costs paid or otherwise settled |  |  | (37.8) | (22.8) |
Ending balance | 10.4 | 21.3 | 10.4 | 21.3 | 4.1
Employee Separation Costs |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 14.7 | 2.9 |
Costs incurred and charged to expense |  |  | 16.7 | 27.8 | 12.0
Costs paid or otherwise settled |  |  | (22.2) | (16.0) |
Ending balance | 9.2 | 14.7 | 9.2 | 14.7 | 2.9
Other costs |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 6.6 | 1.2 |
Costs incurred and charged to expense |  |  | 10.2 | 12.2 | 4.1
Costs paid or otherwise settled |  |  | (15.6) | (6.8) |
Ending balance | $ 1.2 | $ 6.6 | $ 1.2 | $ 6.6 | $ 1.2

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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