v2.4.0.6

Financial Assets And Liabilities (Ineffective Portion And Portion Excluded From Effectiveness Testing Of Derivative Hedge Gains (Losses)) (Details) (Foreign Exchange Contracts [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Oct. 31, 2011 | Oct. 31, 2010
Foreign Exchange Contracts [Member] |  |  |  |
Financial Assets And Liabilities [Line Items] |  |  |  |
Amount of gain recognized in statement of operations on derivatives (ineffective portion) | $ 74 | [1] | $ 788 | [1]
Amount of (loss) recognized in statement of operations on derivatives (excluded from effectiveness testing) | $ 241 | [2] | $ (1,051) | [2]
[1] | The ineffective portion includes forecast inaccuracies.
[2] | The portion excluded from effectiveness includes the discount earned or premium paid for the contracts.

X
- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing the amount excluded from the assessment of hedge effectiveness. + References No definition available. + Details
Name: | snps_DerivativeInstrumentsGainLossRecognizedInIncomeExcludedFromEffectivenessTesting
Namespace Prefix: | snps_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing the amount of the hedge ineffectiveness. + References No definition available. + Details
Name: | snps_DerivativeInstrumentsGainLossRecognizedInIncomeStatementIneffectivePortion
Namespace Prefix: | snps_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | snps_FinancialAssetsAndLiabilitiesLineItems
Namespace Prefix: | snps_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration