XML 58 R46.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Financial Assets and Liabilities - Effects on Changes in Fair Values of Non-Designated Forward Contracts (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Jan. 31, 2018 | Jan. 31, 2017
Financial Assets And Liabilities [Abstract] |  |
Gain (loss) recorded in other income (expense), net | $ (1,571) | $ 59

X
- Definition Financial Assets and Liabilities [Abstract] + References No definition available. + Details
Name: | snps_FinancialAssetsAndLiabilitiesAbstract
Namespace Prefix: | snps_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 + Details
Name: | us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration