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Goodwill and Intangible Assets - Estimated Future Amortization of Intangible Assets, Additional Information (Detail) | 6 Months Ended
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Apr. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract] |
Projects estimated to be completed (years) | 1 year

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- 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

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