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Employee Benefit Plans (Equity Compensation Plans) - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 0 Months Ended
Oct. 31, 2014
Apr. 02, 2014
Oct. 31, 2013
Oct. 31, 2012
Oct. 31, 2011
May 23, 2005
Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Aggregate restricted stock units outstanding 3,947,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		   3,983,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		 3,920,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		 3,454,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		  
Restricted Stock Units | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period, (in years) 3 years          
Restricted Stock Units | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period, (in years) 4 years          
Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Aggregate restricted stock units outstanding 48,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		   53,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		      
Stock Option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares available for future grant 12,155,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 [1]   8,472,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 [1] 7,352,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 [1] 5,911,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 [1]  
2006 Employee Equity Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share based compensation arrangement for options contractual term (in years) 7 years          
Vesting period, (in years) 4 years          
Additional reserved for future issuance under the 2006 Employee Plan   7,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOtherIncreasesDecreasesInPeriod
/ us-gaap_PlanNameAxis
= snps_TwoThousandAndSixEmployeeEquityIncentivePlanMember		        
Share based compensation plan extension (in years)   10 years        
Shares available for future grant 12,200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= snps_TwoThousandAndSixEmployeeEquityIncentivePlanMember		          
Number of shares available contingent upon cancellation or expiration of prior plans 13,178snps_NumberOfSharesAvailableContingentUponCancellationExpirationOfPriorPlans
/ us-gaap_PlanNameAxis
= snps_TwoThousandAndSixEmployeeEquityIncentivePlanMember		          
2006 Employee Equity Incentive Plan | Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Aggregate restricted stock units outstanding 3,900,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= snps_TwoThousandAndSixEmployeeEquityIncentivePlanMember		          
2006 Employee Equity Incentive Plan | Stock Option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Aggregate stock options outstanding 6,800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= snps_TwoThousandAndSixEmployeeEquityIncentivePlanMember		          
2005 Directors Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Reserved for future issuance 318,144us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= snps_TwoThousandAndFiveNonEmployeeDirectorsEquityIncentivePlanMember		         800,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= snps_TwoThousandAndFiveNonEmployeeDirectorsEquityIncentivePlanMember
Restricted stock awards issued 321,550us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_PlanNameAxis
= snps_TwoThousandAndFiveNonEmployeeDirectorsEquityIncentivePlanMember		          
Aggregate grant date fair value of restricted stock awards 8.0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
/ us-gaap_PlanNameAxis
= snps_TwoThousandAndFiveNonEmployeeDirectorsEquityIncentivePlanMember		          
2005 Directors Plan | Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period, (in years) 3 years          
Aggregate restricted stock units outstanding 48,475us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= snps_TwoThousandAndFiveNonEmployeeDirectorsEquityIncentivePlanMember		          
2005 Directors Plan | Stock Option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Aggregate stock options outstanding 42,147us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= snps_TwoThousandAndFiveNonEmployeeDirectorsEquityIncentivePlanMember		          
Aggregate stock options granted under 2005 director plan 123,649snps_AggregateStockOptionsGrantedUnderDirectorPlan
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= snps_TwoThousandAndFiveNonEmployeeDirectorsEquityIncentivePlanMember		          
Fair value of option shares granted 3.3snps_FairValueOfOptionSharesGranted
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= snps_TwoThousandAndFiveNonEmployeeDirectorsEquityIncentivePlanMember		          
2005 Directors Plan | Stock Option | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period, (in years) 3 years          
2005 Directors Plan | Stock Option | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period, (in years) 4 years          
Other Assumed Stock Plans            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Assumed shares remaining outstanding 900,000snps_ShareBasedCompensationArrangementAssumedStockPlansRemainingOutstandingShares
/ us-gaap_PlanNameAxis
= snps_OtherAssumedStockPlansMember		          
[1] Excluding shares reserved for future issuance under the 2005 Directors Plan.