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Goodwill and Intangible Assets - Estimated Future Amortization of Intangible Assets (Parenthetical) (Detail)	9 Months Ended
	Jul. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Projects estimated to be completed	1 year

X

- Definition

Estimated completion period of in process research and development projects.

+ References

No definition available.

+ Details

Name:	snps_EstimatedCompletionPeriodOfInProcessResearchAndDevelopmentProjects
Namespace Prefix:	snps_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration