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Goodwill and Intangible Assets - Summary of Goodwill (Detail) $ in Thousands | 9 Months Ended
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Jul. 31, 2016 USD ($)
Goodwill [Roll Forward] |  |
As of October 31, 2015 | $ 2,471,241 | [1]
Additions | 39,062 |
Adjustments | 435 | [2]
Effect of foreign currency translation | 4,353 |
As of July 31, 2016 | $ 2,515,091 |
[1] | Derived from audited financial statements.
[2] | Adjustments relate to changes in estimates for acquisitions that closed in the prior fiscal year for which the purchase price allocation was finalized during the reporting period.

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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