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Goodwill and Intangible Assets - Summary of Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018
Goodwill [Roll Forward]
Beginning Balance	$ 3,143,249	$ 2,706,974
Additions	23,690	443,007
Effect of foreign currency translation	4,240	(6,732)
Ending balance	3,171,179	3,143,249
Semiconductor And System Design
Goodwill [Roll Forward]
Beginning Balance	2,730,990
Additions	23,690
Effect of foreign currency translation	4,246
Ending balance	2,758,926	2,730,990
Software Integrity
Goodwill [Roll Forward]
Beginning Balance	412,259
Additions	0
Effect of foreign currency translation	(6)
Ending balance	$ 412,253	$ 412,259

X

- 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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