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Income Taxes - Rate Reconciliation Between Provision for Income Taxes and Taxes Computed at Statutory Federal Rate (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2012
Income Tax Disclosure [Abstract]      
Statutory federal tax $ 95,251us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 96,483us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 70,397us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State tax (benefit), net of federal effect (4,306)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes (2,697)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 1,078us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Tax credits (5,153)us-gaap_IncomeTaxReconciliationTaxCredits [1] (24,972)us-gaap_IncomeTaxReconciliationTaxCredits [1] (4,289)us-gaap_IncomeTaxReconciliationTaxCredits [1]
Tax on foreign earnings less than U.S. statutory tax (56,661)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (36,670)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (21,288)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Deferred tax reversal resulting from merger of foreign affiliate 0snps_IncomeTaxReconciliationDeferredTaxReversalResultingfromMergerofForeignAffiliate (6,808)snps_IncomeTaxReconciliationDeferredTaxReversalResultingfromMergerofForeignAffiliate 0snps_IncomeTaxReconciliationDeferredTaxReversalResultingfromMergerofForeignAffiliate
Tax settlements (19,645)us-gaap_IncomeTaxReconciliationTaxSettlements (1,130)us-gaap_IncomeTaxReconciliationTaxSettlements (36,882)us-gaap_IncomeTaxReconciliationTaxSettlements
Stock based compensation 5,675us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost 4,671us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost 9,016us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
Changes in valuation allowance (235)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance (776)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 10us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Federal statute lapses (6,746)snps_IncomeTaxReconciliationFederalStatuteLapseAmount 0snps_IncomeTaxReconciliationFederalStatuteLapseAmount 0snps_IncomeTaxReconciliationFederalStatuteLapseAmount
Other 4,838us-gaap_IncomeTaxReconciliationOtherReconcilingItems (235)us-gaap_IncomeTaxReconciliationOtherReconcilingItems 691us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Provision (Benefit) for income taxes $ 13,018us-gaap_IncomeTaxExpenseBenefit $ 27,866us-gaap_IncomeTaxExpenseBenefit $ 18,733us-gaap_IncomeTaxExpenseBenefit
[1] As a result of the reinstatement of the federal research and development tax credit in fiscal 2013, the Company reflected a benefit of approximately $19 million in the above amount for the period January 1, 2012 through October 31, 2013. The federal research tax credit expired on December 31, 2013 resulting in only two months of credit for fiscal 2014.